Thank you for your post!
I understand that you would like to perform tenant to tenant migration.
Here is a Microsoft documentation which provides a overview of this process.
For your reference: Microsoft 365 tenant-to-tenant migrations
Detailed information can be found in the Tenant-to-tenant migration architecture model
for more reading: AAD user accounts and groups tenant-to-tenant migration
Hope this helps. Do let us know if you any further queries.
Thanks,
Akhilesh.
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