Dear Costar
Thanks for using Microsoft products and posting in the community.
I realize that you've encountered a problem with want to switch your work or personal account and I understand how you feel.
However, I understand that when using a Microsoft 365 work account, you may need to register a tenant or request approval from an IT administrator to use Loop, have you registered a tenant or requested approval from an IT administrator?
Please refer to the specific information: Install the Loop app for Android - Microsoft Support
If you have any other questions or need further assistance, please feel free to contact us.
Best Regards,
Maxine | Microsoft Community Support Specialist