Hello, Ashwini.
Welcome to Microsoft's Community. We are more than happy to assist you.
As we understand, you have two MCIDs and you want to merge them.
To give you a better assistance, we have opened a Private Message as we will request information related to your account. Please look at the right side of the page and click on the icon seen in the image below:
We are attentive for your reply. In case we do not receive a response, the thread will be closed and locked after two business days.
Sincerely,