See here for the description of the problem: Inviting the 'moderators' group to a topic
The current problem is that we can invite at max 10 people at once, but since there are only 5 mods that are active, the problem could be solved by makeing a new group of the active moderators with less than 10 people (seems to be supported by the discourse software), which could then be invited into a thread.
(I decided to put this into a new thread since the other one is dead and many people wouldnt see this b/c it would be neither in “unread” nor in “new”)