Hi @Lukas,
Welcome to the Microsoft Q&A forum.
Thank you for sharing the details of your experience. I understand that managing multiple accounts in Microsoft Teams can be challenging, especially when one of them is a guest account provided by a business partner.
Here’s some information that may help clarify your questions:
When your guest account and main account use the same email address, Teams treats them as the same identity. This is why the app opens the guest account instead of allowing you to add another account. Currently, Teams does not support adding two accounts with the same email address on mobile.
The verification prompts you see are based on security policies set by the organization that invited you as a guest. These policies can include Multi-Factor Authentication (MFA) and sign-in frequency requirements. The timing and frequency depend on their settings, not on your device or app.
As a guest user, you cannot change these settings. Only the organization’s IT administrator can adjust sign-in frequency or MFA requirements.
However, here are a few alternative approaches you can consider:
- Use a different email address for your main account if possible.
- Switch accounts by signing out of the guest account and signing in with your main account when needed.
- Use the desktop or web version of Teams, which makes switching between accounts easier.
- If verification is too frequent, you can ask the partner’s IT admin to review their sign-in frequency policy.
For reference:
- How different technologies affect Microsoft Teams sign-in
- Guest access in Microsoft Teams
- What is Conditional Access?
I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.
Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.
I look forward to your thoughts on this.
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