Forum Discussion
Unable to assign phone number to licensed user
James775 you can assign the number using power shell that the best option the GUI fail some times
Set-CsOnlineVoiceUser -Identity 3c37e1c7-78f9-4703-82ee-a6b68516794e -TelephoneNumber +14255037311
https://docs.microsoft.com/en-us/powershell/module/skype/set-csonlinevoiceuser?view=skype-ps
but you will need to install the skype for business PowerShell model and connect then you can run the script above
https://docs.microsoft.com/en-us/microsoft-365/enterprise/manage-skype-for-business-online-with-microsoft-365-powershell?view=o365-worldwide#:~:text=%20Connect%20using%20a%20Skype%20for%20Business%20Online,for%20Business%20Online%20administrator%20account%20name...%20More%20
Also you can run a get Get-CsOnlineUser -Identity "sip: the email of the affected user "
to get the object id needed for the script above "Identity"