Microsoft has announced that, effective Oct. 1, Teams Rooms will no longer support connections to the Skype for Business server, impacting, it says, a small number of customers using on-premises configurations. With this change, the following meeting mode options will no longer be available on the Teams Rooms on Windows app (version 4.19) settings:
Skype for Business only
Skype for Business and Microsoft Teams (default)
Skype for Business (default) and Microsoft Teams
The announcement stated that, in addition to the modes listed above, all Skype for Business related settings will be removed from the device settings and setup experience. The legacy home screen that allowed support for Skype for Business Server in Teams Rooms on Windows will also no longer be available. With this change the setting used to ‘opt-out’ of the new experience (TeamsRoomsNewExperience) will also be removed.
The company offers guidance on migrating to Microsoft Teams at: