I'm trying to link Trello and BitBucket together. I am using the same Atlassian account for both as the admin account. I installed the Power-Up in Trello. I went to each repo in BitBucket and added Trello:

I can see Trello in BitBucket on the repo page.
When I try to connect BitBucket in Trello, I get the question to authorize (which I do), click allow in the popup. But then I get this error:

The invite button is right there. And it works. I get the same error if I do this from inside BitBucket or if I go directly to Trello.