Hello @Chandramouli Pathanjali , thanks for confirming. Looks like this issue is related to your Microsoft 365 account
please contact Microsoft 365 support or try posting your question here: Microsoft Community.
As mentioned earlier try these troubleshooting steps: https://learn.microsoft.com/en-us/microsoft-365/troubleshoot/access-management/account-blocked-error-when-sign-in
I hope this helps.
Regards,
Vasavi