Configure Office 365 Tenant – Upgrade Policy Teams Only
If the upgrade mode cannot be saved in the Teams Admin Center. The scenario can be checked via Powershell, for this we create a Microsoft Teams Powershell.
Import-Module MicrosoftTeams $cred = Get-Credential $session=New-CsOnlineSession -Credential $cred Import-PSSession $session -AllowClobber PS C:\> Get-CsTenant | Select TeamsUpgradeEffectivemode TeamsUpgradeEffectiveMode ------------------------- TeamsOnly
The mode can be changed as follows:
PS C:\> Grant-CsTeamsUpgradePolicy -PolicyName UpgradeToTeams -Global WARNING: *All* users in this tenant are now full Teams-only users, except for any users that have an explicit policy assignment of TeamsUpgradePolicy. Teams-only users cannot us e Skype for Business clients, except to join Skype for Business meetings. For details, see http://aka.ms/UpgradeToTeams.
If you get the following error message, you should check the DNS entries.
This organization cannot be upgraded to TeamsOnly at the tenant level because there is an on-premise deployment of Skype for Business detected in 1 or more of it sip domains, domain.com. Users can be individually upgraded to TeamsOnly using either Move-CsUser (if the user has an on-premises Skype for Business account) or Grant-CsTeamsUpgradePolicy (if the user is homed in Skype for Business online).