Hi @Tim Sommer
Do other guests in the organization have the same issue?
Will your administrator remove you from the organization?
If your administrator doesn't do anything else, you can't access the organization you're a member of. Please contact your administrator to run the following tests to verify that guest access is correctly configured for use in Microsoft Teams.
1. Select Run Tests below to populate the diagnostic in the Microsoft 365 admin center.
2. The test result will tell you if the tenant is configured correctly for Guest Access. If the tenant isn't configured correctly, the diagnostic will provide information on what steps to take to address issues with tenant or policy configurations.
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