If you are trying to add another of your Office/Business or School accounts to the Microsoft Teams App on your Computer or Mobile App, you will get the below error message.

This is because Teams as of now does not allow adding multiple Microsoft 365 Business accounts at the same time.
This feature was requested as feedback to Microsoft and is a work in progress.
Feedback Link: https://feedbackportal.microsoft.com/feedback/idea/d256e0f6-262e-ec11-b6e6-00224827bbc2
Workaround for Multiple Teams Login to Business Accounts
- You can make use of team for web-browser and have multiple users logged in that way!
- Make use of different browsers to have multiple user sessions active on the same computer.
- Make use of Private/Incognito mode to have multiple active team sessions.
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