Use devise_invitable with the activeadmin gem

Hey! I'm looking for a complete guide on being able to invite my non-admin devise users through the admin panel. Strangely I can't find a single, comprehensive enough, resource on this topic. Can't imagine I'm the only one to use devise_invitable with activeadmin. The list of the different errors I encounter trying to implement this is just too long to post. I'm in desperate need of some guidance. Anyone here who can help out? Can't imagine it would be that hard.

Thanks a lot in advance!

/ Jacob