@mitpl use Opera Beta or Opera GX if you wanna access Aria. It's the same for me. I use the same opera account on all three browser variants. But it's not accessible on Opera One of all. I'm even waiting for the recent Chess.com collaboration update, is it here yet???
I'm using the latest version of Opera One 104.0.4944.36 and on Windows 11 Pro. I live in India however I bought this laptop from the UAE which is an unavailable country (Saudi Arabia) for Aria. But that still doesn't explain why I can still access it on Beta and GX, but not on One.
I used Beta for a while, but switched back to One because Beta doesn't support Kaspersky Password Manager, and has some bugs with the tab island appearance and can't relocate the pinned tabs. GX has everything, you can even get discord on the side bar.