When logging into a website using Facebook, I get error 400 "Sorry, something went wrong. We're working on it and we'll get it fixed as soon as we can."

[amico3103]

Previously, authorization via Facebook worked fine, now it gives an error with a code 400 and text as in the screenshot. What could be the problem?

More details here
https://developers.facebook.com/support/bugs/432332661918868/

This appeal also fixes a similar problem.
https://developers.facebook.com/support/bugs/433449821785769/?join_id=f52c09daca134c