Hi Ramkumar,
Do you already have Azure Administrator Associate certification (AZ-104 exam) or Azure Developer Associate certification (AZ-204 exam)? At least one of these is required in addition to passing AZ-400.
If you have at least one of the prerequisite certifications then please ask your question in the Microsoft Credentials forum using link below. There are support moderators over there that will respond to your question in 1 business day and can assist:
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
Please click Accept Answer and upvote if above was helpful.
Thanks.
-TP