In regards to MC226038, I'm sure I know the answer, but the description is making me ask...
Here is the update.
We're making some changes to how you enable Microsoft Teams for individual users within your tenant. We're removing the Microsoft Teams enablement setting from within the Microsoft 365 admin center and will rely solely on Microsoft Teams license allocation to decide if a user has access to Microsoft Teams.
Timing: Beginning December 03, 2020
Control: License allocation
Action: Review and assess
How this will affect your organization:
If a user within your tenant is given an active Microsoft Teams license, they will have access to Microsoft Teams. No additional access checks will be made.
Certainly the 'no additional access check will be made' won't apply to Conditional Access Policies, right? If i am blocking users with CA policies, they will still be stopped from using Teams even if they are licensed?