marcZH
4
OK, this is solved. It was as easy as to type in the three fields:
- Login dialog redirect
- Access token endpoint
- User profile endpoint
the same information that was already there. By chance the API used in the example (Spotify) is the one I was trying to connect to, and I did not realize the text was greyed out and was not being taken…
one week fighting with this 

Dear @Bubble folks, is there any way to make this a little bit more clear/evident?
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