To inform users about the new productivity features and the ability to sign in with different accounts, Microsoft will show a banner in the activity feed for Teams mobile app users.
How this will affect your organization:
Once the change has rolled out to your tenant, users will see a banner in their activity feed saying that they can add a personal account to the Teams app on their mobile device. If you have previously disabled the ability to add additional accounts, users will not see the banner.
To manage the visibility of the banners to your users, you can submit a help ticket in the Microsoft 365 admin center and your tenant will be excluded from the banners. This will not limit your user’s ability to add a personal, work or school account to the Teams app. If you want to restrict users from adding a personal, work, or school account, instructions are available here. Restricted users will not see the banner.
What you need to do to prepare:
There is no action you need to take to prepare for this change, but you might consider updating your user training and notifying your help desk.
More information about the personal experience in Teams can be found here.