Without warning (for security reasons), Microsoft stopped the Exchange Online Set-User cmdlet being able to update the work and mobile numbers for Azure AD accounts. We don’t know what kind of security concerns caused Microsoft to take this action, but it might be associated with administrative roles. In any case, this disappointing example of how to communicate with customers might end up with people having to update some PowerShell scripts – and no one likes unexpected work.
https://office365itpros.com/2021/05/11/set-user-stops-working/
