Thanks for the follow up.
We do use Discourse Connect, but also use the API.
BTW, you mentioned It might have been the non-admin route, though
So that PUT request would be :
/groups/{group_id}/members.json
…with 'email': (user email) as payload…and Discourse just knows my user has admin rights to be able to add that user to that group?
(…sorry, I’m fuzzy on why there are two routes for this same operation…)