Above is some screenshots i took when i try to sync my account on Opera GX. I did try to reset password, clean web cache but it's still loading (i waited for over 1h).

But in the setting, it seems like i did sign in successfully.

Also in my Android phone, i downloaded the lastest ver of Opera browser (not Opera Mini), but i can't login my account. When i entered my password, it succeeded in 1 sec and then auto logout immediately. My bookmarks are still there, but i can't sync my password. I also tried sync by "connect device" and scanned QR code, but it failed too.