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Hi @Hadib Changriha
Thank you for posting your question in the Microsoft Q&A forum.
Based on the information you provided, I understand that you are unable to join the Microsoft 365 Developer Program and are receiving a "Request failed with status code 500" error during enrollment. You have already attempted various troubleshooting steps, such as changing browsers, clearing cache, and switching networks, but the issue persists.
May I ask if you are signing in with a business account or a Personal account?
If you are using a personal account, the issue may be due to delays in preparing the sandbox in the background. I recommend waiting a few days and trying again with the same account linked to Microsoft Learn. In case you still encounter the error after waiting, here are two alternative solutions you can try:
-Contact Microsoft Support
You can try contacting Microsoft Unified Support via the phone numbers listed in the following link:
-Use a Visual Studio Subscription
A more stable alternative is to use a Visual Studio Professional or Enterprise subscription. If you possess one of these subscriptions, you automatically qualify for a Microsoft 365 developer subscription, and it will renew automatically.
Therefore, please refer to the Visual Studio page below to check your eligibility:
I hope this clarification helps.
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