@Yordan Yordanov, Thanks for posting in Q&A. In General, App protection policies are associated with user account. When the user login the app, it will apply the App protection policy. So it can be applied to the app on a device that is registered to another tenant. However, in this scenario, other user accounts are unable to login Outlook and Teams apps since the IT department deployed app protection policies that protect the account in these apps. To use the account on the device with these apps, the user needs to unregister the account from the first tenant in the Company Portal.
References:
- App protection policies overview - App protection experience for Android devices
- Mobile Application Management and personally-owned work profiles on Android Enterprise devices in Intune
- Deployment guide: Mobile Application Management (MAM) for unenrolled devices in Microsoft Intune
Hope the above information can help.
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