Same issue on all opera android browser - Opera for android, opera for android beta and both stable and mini browser.

Can go to opera.com and login. also working fine on other android phones.

As above posters I use opera as it allows sync between pc and phone. If that's not working there is little benefit but doesn't seem like they are trying to fix this any more as replies have stopped.

Samsung S7
Android 6.0.1
Opera effected - all in store