Thank you for your response. If you are trying to move application from one Entra ID to another Entra then this is not possible as of now.
To move the registration to a new AD all you need to do is delete the app registration under the old tenant and create a new application in the new tenant.
If the old Entra ID will still be in use you can share the app to multiple tenants which would not affect current users. So, users in the new Entra will basically have access to the shared app from the old Entra.
However, you can submit feedback regarding this in our Azure feedback portal if you are looking for this feature in the future.
Let me know if you have any further questions.
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