Hello @Riaz Ahmad
Thank you for sharing this concern on this community space.
I am thinking of the following relevant points to check for this case scenario as shown down below:
1- Is the 90-day Microsoft 365 E5 developer subscription period gone or not yet?
2- Did you check your user account from the admin portal in order to know if it is on active status? https://admin.microsoft.com/Adminportal/Home#/homepage
3-When was the last time that you were able to login correctly?
Let me know if that was useful but if not, I can keep assisting you further.
Looking forward to your feedback,
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