Hi @Ehtisham Malik , from this thread:
You will have to re-create the user accounts and relationships (groups, roles, policies, etc) in the new tenant. You can try using the AzureAD Powershell module with something like this: https://github.com/alfredorevilla-msft/Move-users-from-Azure-AD-Tenant-to-a-different-Azure-AD-Tenant/blob/master/Main.ps1
Please let me know if you have any questions or need help with this!
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Thank you,
James