XenForo OAuth2 between 2 xenforo forums

[Faust]

Hi. Is anyone here did set up successfully connected account between 2 forums? I am really struggling to set one up, not sure what I am doing wrong but I always have this back:

Code:

An error occurred while connecting with XenForo. Please try agai

I've asked for support via ticket, and that wasn't helpful either, after renewing 2 licenses.

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