Connected account providers miss Xenforo?

[Robert9]

A long time ago, there was an add-on to pair two forums, i cant remember clearly, maybe it was for xf1.
What I would like to have is not facebook or things like this, i want to have xenforo itself as a connected account provider.


I am in forum A come to forum B (A is listed there as allowed); a user says, ok, i come from A, then I add him as a user (if name is used as user_id) and let him inside.

Do we have something like this?
Connected account providers miss Xenforo?

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