Dear @aakash jain
If you are moving to a new phone and want to transfer your Microsoft Authenticator accounts, the process depends on whether you still have access to your old phone.
If you still have your old phone, you can use the backup and recovery feature in Microsoft Authenticator to restore your accounts on the new device. However, you will generally need to sign in with the same Microsoft account that was used to create the Authenticator backup.
If you do not remember the email address associated with your Microsoft account, you can try Microsoft's account recovery options to identify or recover the account before setting up Authenticator on the new phone.
If you no longer have access to the old phone or cannot complete the required verification, you may need to contact your organization's administrator if this is a work or school account. An administrator can reset your MFA/Authentication Methods and require you to register Microsoft Authenticator again on the new device.
For a personal Microsoft account, you can use Microsoft's account recovery process to regain access to the account first.
I would recommend not removing Microsoft Authenticator from the old phone until you have successfully registered the new phone, if the old device is still available. This will help prevent you from being locked out of the account.