Używanie nowego programu Outlook dla systemu Windows na potrzeby osobistej poczty e-mail, kalendarza i zarządzania kontaktami
Hey there!
I'm sorry that you are facing this issue.
You might see this error if your primary alias's name is the same as an existing work or school account in Microsoft 365 or Azure Active directory.
Please go through the steps mentioned in below Mircrosoft article to fix the issue.