Hi Nuiin, I also had a similar issue here after a while when logging into Opera One again, just after this has been going public.
Unfortunately, I already have an Open AI account and just wanted to try the differences or improvements that Opera One would bring compared to the original Open AI chat or Bing Chat. After being already logged in the Aria bit didn't recognize my login credentials or at least didn't want to give me an answer here.
So, see you later, Opera One.
Joining Open AI now to get an answer within my lifespan.
Despite this difficulties, I have to state that I really like the intro video for the new Opera One.