Using Foreman 1.10.2-el7, I noticed that non-admins are unable to access parameters within the "Edit Locations" section when adding all parameter permissions from within the UI.
Reviewing the filter permissions for the Parameters category, it appears the "view_params" permission does not show up which is needed for this feature to be shown to non-admins.

I've added the view_params permission into the permissions table then added the view_params permission to the role and everything worked as expected :)
insert into permissions (name,resource_type,created_at,updated_at) values ('view_params','Parameter',NOW(),NOW());

I'm unsure if this permission has been deprecated and needs to be altered within app/views/taxonomies/_form.html.erb or if we need to alter the seeds.d/03-permissions.rb to include the perm.

from foreman-dev. The use of view_params should probably be removed from this one view or implemented everywhere.