Renaming UPN in e.g. Azure AD is not seen as same account by OneDrive.
When changing the logon UPN of an account in Azure AD. The account should be the same as the previous account. But OneDrive considers these as different accounts.
e.g. renaming bla@contoso.com to blabla@contoso.com the account is technically the same account, identified by the AD object id.
When can this situation arise? E.g. a divorce where the last name is changed back to the maiden name for instance.
