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,
Cheers,
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.