When using the "Run Puppet" button on hosts in Foreman, under the mco provider, it will send the command to mco with a lower case fqdn that will then fail to find it:

mco ping:
Ultralisk time=104.35 ms

Command that is sent:
[root@puppet etc]# /usr/bin/mco puppet runonce -I ultralisk
No request sent, we did not discover any nodes.

but if you manually run it with the correct case it works fine.