Kattello agent will not install - package not signed

Hi, I am new to both linux and foreman / kattelo so bear with me. Hopefully this is an easy fix.

I have taken over a foreman / katello environment and have not had time to learn. And with only a production environment to learn in I have to be careful.

The problem is that the last thing the previous administrator did was upgrade to katello 3.6 and now the kattelo agent will not install on new hosts with the error message package not signed.

I cannot find a sign section in the gui or the documentation - what to do?

Morten

Can someone from @katello team please take a look?