SOLVED - the issue was on our side
We are working on integrating the Miro oauth2 flow, for the miro boards picker.
The oauth2 flow worked completely fine last week, but today it stopped working.
Not clear as to which step fails for now, but the app gets installed to the user, but eh callback we get from Miro contains an error.
We have not changed any of our configs or oauth2 startegy.
Any idea what could have happened?