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TLS 1.0 and TLS 1.1 have been deprecated.
Moving users from On-Premises to Teams requires TLS 1.2. In Skype for Business Server 2015 CU12, Skype for Business Server 2019 and later versions, OAuth is always used hence the switch is not relevant on those versions. If you are using Skype for Business Server 2015 with CU8 up to CU11, we recommend you pass the -UseOAuth switch, which ensures the on-premises code authenticates using OAuth, instead of Legacy LiveID authentication. When migrating from on-premises to the cloud, contacts from Skype for Business Server are migrated to the cloud (unless -force switch is used in move-csuser) and become available in Teams after the user logs on to Teams after the move. Teams-only users can still join meetings hosted in Skype for Business (which may happen if they are invited to a meeting by a user that is using Skype For Business). It is no longer necessary to specify the -MoveToTeams switch, and specifying this switch no longer has any impact. This happens regardless of which on-premises version of Skype for Business Server or Lync Server is used. When migrating from on-premises to the cloud, users are automatically assigned TeamsOnly mode and their meetings from on-premises are automatically converted to Teams meetings. For more details, see Move users between on-premises and cloud. In most cases, this is "" but in specialized environments, there will be variants of this address. To move a user to Microsoft 365, specify the ProxyFqdn of the hosting provider as the Target. For more information, see Deploy hybrid connectivity between Skype for Business Server and Skype for Business Online.
Skype for Business hybrid must be configured. When moving a user to the Microsoft 365 cloud to become TeamsOnly (or the reverse): The Move-CsUser cmdlet affects only the user's Skype for Business Server account location it does not move the user's Active Directory account to a new organizational unit (OU) or other new location. from one registrar pool to another, in an on-premises Skype for Business Server deployment. from an on-premises Skype for Business deployment to Teams-only in Microsoft 365 (or the reverse). The Move-CsUser cmdlet enables you to move a user account enabled for Skype for Business in the following scenarios: This cmdlet also can be used to move on-premises users from one pool to another. Moves one or more user accounts enabled for Skype for Business Server to TeamsOnly (or the reverse).