Hi - I received the below response when I queried a different character a while back:
Hi Natasha,
The character Ö doesn't meet the UPN prefix requirements, so we can't use it. As a workaround, I suggest using English name to replace it.
Moreover, I suggest you submit feedback to our product team about your suggestion. Our feedback analysis specialists will evaluate the advice you provided. So far, many features are improved based on customers’ feedback. This will help our product to be designed better. Thanks for your effort and contribution.
Regards,
Jerry Cen
Neither of you answers today mention that Ö is not a valid character. Is this now supported? If not please can you provide a full list of characters that do not meet the UPN prefix requirements.
Kind Regards
Natasha