Hi Mahesh,
Do you have at least one of the 5 prerequisite certifications (MD-102, MS-203 (retired), MS-700, SC-300, SC-400). One of these is required in addition to passing MS-102 exam in order to earn Microsoft 365 Certified: Administrator Expert certification.
If you don't have one of the five prerequisites then you just need to pass one of the five exams within one year of when you passed MS-102 and both certifications will show up.
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP