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Hello @Nikiforos Plastiras,
Welcome to the Microsoft Q&A Forum and thank you for your question.
With this kind of situation, the most reliable step you can take now is to reach out to Microsoft Support, so their backend engineers can review your tenant directly. They have the internal diagnostic tools needed to fully analyze what’s happening behind the scenes, so you should open a support ticket with Microsoft to make sure the issue is properly investigated.
You can follow the steps below to contact them:
- Sign into the Microsoft Admin Center
- After clicking on "Help & Support" button like this image, you can type "I need agent support via phone or email". After that, you can click on "Contact support"
- Choose contact method: "Phone"
- Fill all the information in this contact support details, please describe your situation carefully so they will have enough information to help you.
- Finally, clicking on "Contact me"
After completing them, you will receive an email appointment for a meeting to review this issue professionally together.
If you run into any difficulty while creating the ticket or if anything feels unclear, please feel free to let me know. I’m here to help you through the process.
Kind regards,
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