Hi Valentin!
Thank you for reaching out to Microsoft’s Community.
As we understand, you want to update the information displayed in your Certification profile to take an exam. We will be happy to assist you with your inquiry.
Please bear in mind that special characters, such as "ö" are not allowed on our platform. Only characters within the English alphabet can be entered when creating your Certification Profile and updating your information.
In these cases, instead of the special character, we advise entering its English equivalent or the closest letter in the English alphabet (ö to o).
To proceed with your Legal Name change request, please fill in this form: Microsoft Certification Profile Name Change Request Form and share with us your Ticket ID via Private Message:
Private Messages - Microsoft Community
Once you receive an update from the Legal Name Change department, please let us know to see if everything was solved.
We are looking forward to your information. If no response is received within two business days, we will proceed to close and lock this case as well as the Private Message.
Best regards,