Hi @Martin Kohlíček
Thank you for reaching out through the Microsoft Q&A forum. We understand your concern, and we’d like to offer the following suggestions that may help resolve the issue. Please try signing back into your original account and review the points below:
- To activate the E5 developer sandbox in the Microsoft 365 Developer Program, you need to meet certain eligibility criteria: Microsoft 365 Developer Program FAQ | Microsoft Learn.
- Please ensure that you have met all the requirements specified by Microsoft for accessing the E5 developer sandbox. If you believe you meet the criteria and are still facing issues, you can reach out to Microsoft Developer Support for further assistance: Contact Us - Developer Support.
If you are unable to sign in to your account, we recommend submitting a support request via Contact - Microsoft Support
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As forum moderators, we don’t have access to the detailed system needed to troubleshoot this effectively due to privacy and security constraints. We recommend contacting Microsoft’s support team directly, as they are best equipped to address and resolve this type of issue efficiently.
We hope this information is helpful and appreciate your understanding.
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