Block Guest Access for Specific Teams - incl. PowerShell Script

Block Guest Access for Specific Teams in Microsoft Teams

To minimize the risk of data loss and sprawl from freely added guests in Microsoft Teams, it often makes sense to disable guest access.

But what if collaboration with external parties is a central part of your work?

Find out how international machine manufacturer GROB solved this issue.

Maybe you want to disable guest access for a few specific teams, not for all teams.

Or vice versa, you want to allow guest access for individual teams, while deactivating it overall.

In such cases, you can control guest access for the individual team or the associated M365 group individually. When deactivated, new guests can then no longer be added. Existing guests, however, remain in the group or team, they are not removed by this.

Note: There is of course also the possibility to allow guest access in general, but to specify in great detail what guests can and cannot do. Read more about this our blog post Microsoft Teams Guest Access (Part 1).

The individual control of guest access can be implemented either with Sensitivity Labels assigned to each team or group, or with a PowerShell script that allows you to change the group settings of an individual group. Third-party tools like the Teams Manager or External User Manager also offer a handy solution. (Please note that the linked SharePoint site behind the team has its own guest access controls).

If you’re looking for an easy way to control guest access for individual teams, we recommend using Teams Manager. The Teams Manager app is built precisely to give you full control over individual teams.

External User Manager gives IT admins all the features they need for better Microsoft 365 guest user management. You can not only minimize the risk from guests who can be added freely, but you can also have them sign documents such as NDAs, ensuring that guests are integrated into your system in a legally correct way. In addition, External User Manager can regularly check whether guests still need access or can be removed from your environment.

Book a free demo to see more!