Ive got the same problem, I.e. "Connection Error", where no connectivity problems exist.
I too can log in successfully to my account page on the same Opera Mini browser on iOS that is refusing to sync! So its not an account issue either.
I also successfully sync Opera on Android, Windows10 and Macos.
Something is clearly going wrong with Opera sync login just on iOS!
Posts made by comfunc
RE: Unable to Sign In on MiniiOS