On a fresh 3.2.0 install on rocky linux 8, I get the following bug report whilst configuring the first host:

2022-04-14T13:20:08 [W|app|ace93198] Fetch TFTP boot files for host.example.com task failed with the following error: undefined method `constantize' for nil:NilClass
2022-04-14T13:20:08 [I|app|ace93198] Backtrace for 'Fetch TFTP boot files for host.example.com task failed with the following error: undefined method `constantize' for nil:NilClass' error (NoMethodError): undefined method `constantize' for nil:NilClass
 ace93198 | /usr/share/foreman/app/models/operatingsystem.rb:334:in `pxe_file_names'
 ace93198 | /usr/share/foreman/app/models/operatingsystem.rb:338:in `boot_file_sources'
 ace93198 | /usr/share/foreman/app/models/operatingsystem.rb:326:in `boot_files_uri'
 ace93198 | /usr/share/foreman/app/models/operatingsystem.rb:202:in `pxe_files'
 ace93198 | /usr/share/foreman/app/models/concerns/orchestration/tftp.rb:114:in `setTFTPBootFiles'
 ace93198 | /usr/share/foreman/app/models/concerns/orchestration.rb:227:in `execute'
 ace93198 | /usr/share/foreman/app/models/concerns/orchestration.rb:152:in `block in process'
 ace93198 | /usr/share/foreman/app/models/concerns/orchestration.rb:144:in `each'
 ace93198 | /usr/share/foreman/app/models/concerns/orchestration.rb:144:in `process'
 ace93198 | /usr/share/foreman/app/models/concerns/orchestration.rb:44:in `around_save_orchestration'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:121:in `block in run_callbacks'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:139:in `run_callbacks'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:825:in `_run_save_callbacks'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/callbacks.rb:327:in `create_or_update'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/timestamp.rb:128:in `create_or_update'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/persistence.rb:470:in `save'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/validations.rb:47:in `save'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/transactions.rb:314:in `block in save'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/transactions.rb:375:in `block in with_transaction_returning_status'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `block in transaction'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/connection_adapters/abstract/transaction.rb:280:in `block in within_new_transaction'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/connection_adapters/abstract/transaction.rb:278:in `within_new_transaction'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `transaction'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/transactions.rb:212:in `transaction'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/transactions.rb:366:in `with_transaction_returning_status'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/transactions.rb:314:in `save'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/suppressor.rb:44:in `save'
 ace93198 | /usr/share/foreman/app/models/concerns/foreman/sti.rb:26:in `save'
 ace93198 | /usr/share/foreman/app/controllers/hosts_controller.rb:97:in `create'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/abstract_controller/base.rb:195:in `process_action'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal/rendering.rb:30:in `process_action'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/abstract_controller/callbacks.rb:42:in `block in process_action'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:112:in `block in run_callbacks'
 ace93198 | /usr/share/foreman/app/controllers/concerns/foreman/controller/timezone.rb:10:in `set_timezone'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:121:in `block in run_callbacks'
 ace93198 | /usr/share/foreman/app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:121:in `block in run_callbacks'
 ace93198 | /usr/share/foreman/app/controllers/concerns/foreman/controller/topbar_sweeper.rb:12:in `set_topbar_sweeper_controller'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:121:in `block in run_callbacks'
 ace93198 | /usr/share/gems/gems/audited-4.9.0/lib/audited/sweeper.rb:14:in `around'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:121:in `block in run_callbacks'
 ace93198 | /usr/share/gems/gems/audited-4.9.0/lib/audited/sweeper.rb:14:in `around'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:121:in `block in run_callbacks'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:139:in `run_callbacks'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/abstract_controller/callbacks.rb:41:in `process_action'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal/rescue.rb:22:in `process_action'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/notifications.rb:180:in `block in instrument'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/notifications/instrumenter.rb:24:in `instrument'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/notifications.rb:180:in `instrument'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal/instrumentation.rb:32:in `process_action'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
 ace93198 | /usr/share/gems/gems/activerecord-6.0.3.7/lib/active_record/railties/controller_runtime.rb:27:in `process_action'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/abstract_controller/base.rb:136:in `process'
 ace93198 | /usr/share/gems/gems/actionview-6.0.3.7/lib/action_view/rendering.rb:39:in `process'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal.rb:190:in `dispatch'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_controller/metal.rb:254:in `dispatch'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/routing/route_set.rb:33:in `serve'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/journey/router.rb:49:in `block in serve'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/journey/router.rb:32:in `each'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/journey/router.rb:32:in `serve'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/routing/route_set.rb:834:in `call'
 ace93198 | /usr/share/gems/gems/apipie-dsl-2.4.0/lib/apipie_dsl/static_dispatcher.rb:67:in `call'
 ace93198 | /usr/share/gems/gems/apipie-rails-0.5.17/lib/apipie/static_dispatcher.rb:66:in `call'
 ace93198 | /usr/share/gems/gems/apipie-rails-0.5.17/lib/apipie/extractor/recorder.rb:137:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/static.rb:126:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/static.rb:126:in `call'
 ace93198 | /usr/share/foreman/lib/foreman/middleware/libvirt_connection_cleaner.rb:9:in `call'
 ace93198 | /usr/share/foreman/lib/foreman/middleware/telemetry.rb:10:in `call'
 ace93198 | /usr/share/gems/gems/apipie-rails-0.5.17/lib/apipie/middleware/checksum_in_headers.rb:27:in `call'
 ace93198 | /usr/share/foreman/lib/foreman/middleware/catch_json_parse_errors.rb:9:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/tempfile_reaper.rb:15:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/etag.rb:27:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/conditional_get.rb:40:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/head.rb:12:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/http/content_security_policy.rb:18:in `call'
 ace93198 | /usr/share/foreman/lib/foreman/middleware/logging_context_session.rb:22:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/session/abstract/id.rb:266:in `context'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/session/abstract/id.rb:260:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/cookies.rb:648:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/callbacks.rb:101:in `run_callbacks'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
 ace93198 | /usr/share/gems/gems/railties-6.0.3.7/lib/rails/rack/logger.rb:37:in `call_app'
 ace93198 | /usr/share/gems/gems/railties-6.0.3.7/lib/rails/rack/logger.rb:28:in `call'
 ace93198 | /usr/share/gems/gems/sprockets-rails-3.2.1/lib/sprockets/rails/quiet_assets.rb:13:in `call'
 ace93198 | /usr/share/foreman/lib/foreman/middleware/logging_context_request.rb:11:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/request_id.rb:27:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/method_override.rb:24:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/runtime.rb:22:in `call'
 ace93198 | /usr/share/gems/gems/activesupport-6.0.3.7/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/executor.rb:14:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/static.rb:126:in `call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/sendfile.rb:110:in `call'
 ace93198 | /usr/share/gems/gems/actionpack-6.0.3.7/lib/action_dispatch/middleware/host_authorization.rb:76:in `call'
 ace93198 | /usr/share/gems/gems/secure_headers-6.3.0/lib/secure_headers/middleware.rb:11:in `call'
 ace93198 | /usr/share/gems/gems/railties-6.0.3.7/lib/rails/engine.rb:527:in `call'
 ace93198 | /usr/share/gems/gems/railties-6.0.3.7/lib/rails/railtie.rb:190:in `public_send'
 ace93198 | /usr/share/gems/gems/railties-6.0.3.7/lib/rails/railtie.rb:190:in `method_missing'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/urlmap.rb:74:in `block in call'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/urlmap.rb:58:in `each'
 ace93198 | /usr/share/gems/gems/rack-2.2.3/lib/rack/urlmap.rb:58:in `call'
 ace93198 | /usr/share/gems/gems/puma-5.5.2/lib/puma/configuration.rb:249:in `call'
 ace93198 | /usr/share/gems/gems/puma-5.5.2/lib/puma/request.rb:77:in `block in handle_request'
 ace93198 | /usr/share/gems/gems/puma-5.5.2/lib/puma/thread_pool.rb:340:in `with_force_shutdown'
 ace93198 | /usr/share/gems/gems/puma-5.5.2/lib/puma/request.rb:76:in `handle_request'
 ace93198 | /usr/share/gems/gems/puma-5.5.2/lib/puma/server.rb:447:in `process_client'
 ace93198 | /usr/share/gems/gems/puma-5.5.2/lib/puma/thread_pool.rb:147:in `block in spawn_thread'
 ace93198 | /usr/share/gems/gems/logging-2.3.0/lib/logging/diagnostic_context.rb:474:in `block in create_with_logging_context'
2022-04-14T13:20:08 [W|app|ace93198] Rolling back due to a problem: [#<Orchestration::Task:0x00005632eb37d3d0 @name="Fetch TFTP boot files for ....]

Incase you need need more logs or information, please let me know.