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Hi Chayadevi,
Do you have at least one of the prerequisite certifications (exams AZ-104 or AZ-204)? One of these is required in addition to passing AZ-400.
If you already have the prerequisite 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 with getting your certification to show up:
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
Please click Accept Answer and upvote if above was helpful.
Thanks.
-TP