Forum Discussion
How to restrict Microsoft Teams Exploratory sign-up
Is there a way to restrict users from Microsoft Teams Exploratory sign-up? Microsoft suggests to turn this off by disabling the option “Let Users install trial apps and Service” from Admin center. Bu...
NishaPS See this article: https://docs.microsoft.com/en-us/MicrosoftTeams/teams-exploratory
You can disable the Exploratory license per user if they already onboarded.
The Exploratory license is visible after the first user uses this experience.
A user who is assigned a license that includes Teams isn't eligible for the Teams Exploratory experience. When the Teams service plan is turned on, the user can sign in and use Teams. If the service plan is disabled, the user can't sign in and the Teams Exploratory experience isn't available.
JanBakkerOrphaned Thanks for the respose. 
The following set-up in O365 admin will fix this without impact to other trial licenses.
- From the https://portal.office.com/adminportal/home, go to Settings > Settings, select Services, and then select User owned apps and services.
- Clear the Let users install trial apps and services check box and Save the changes