@tauric If that is really the case, them they are sending the wrong information to their users. When they say that Opera is not supported, they are saying that they don't support Opera and are the ones to blame for the problem.
I created an account literally just to reply to this post. This has been an issue for at least two years. They do not care. They are not going to fix it. Time to move on, honestly.
I understand you have stated that they are disabled in startup, However I have two questions. First, is your device shared with anyone else? And second, How did you disable them in startup? There are a few ways to do it, but only one works directly.
@sumi123344 Well, a backup is the only chance to try to recover the access to your account and it may even not work. Other than that, just through Facebook.