For me, it's exactly the same situation. Last time I tried after updating Opera Mobile to version 88, but nothing changed.
Can anyone else confirm this issue?
@juiceboxkai If you don't remember your Opera account password, just go to auth.opera.com while logged off or using a private window and use the "Forgot My Password" tool.
@afnhermes Unfortunately, if you don't remember the old Opera account password, your synced saved passwords can't be decrypted and, therefore, won't be available to be used.
@Adilkhanreal To get your synced data on the new installation, you need to login to sync using the profile icon on the top right, menu > synchronise or settings page.
@nudewing If your old computer is still working, it would be possible to export all your old passwords to a CSV file, and then import them into Opera on your new machine. But to use Sync, you need the old password as your passwords were encrypted to that.