We have, unfortunately, experienced that some of our customers have Teams automatically installed with newer Microsoft Office 365 updates, and changes the way Skype for Business works in your organisation.
If you want to use Teams in your organization alongside our Skype for Business solution
If you want to use Teams at the same time as our Skype for Business solution, you need to change the coexistence state between Teams and Skype for Business.
The only way to accomplish this is currently in Office 365 via Powershell (with a administrator login, of course). Run the command below to change the coexistence state.
PS C: Grant-CsTeamsUpgradePolicy -PolicyName SfBWithTeamsCollab -Global
After running the above, the coexistence mode should be changed to SfBWithTeamsCollab.
Note that if the coexistence state changes to other values, it may affect federation patterns against other Office 365 tenants.
If you do not want to use Teams in your organization
If you do not want to use Teams in your organization, disable the Teams license in Office 365 under Product licenses.
We are in continuous dialogue with Microsoft about this challenge and are keeping this support article up to date
(Updated 12 February)