Hi Yancy,
Thank you for posting your query. According to your description, it is clear that you want to migrate the CAL without specified information. In this way, we can't process the migration successfully. More information related to migrate RDS CALs can be referred to this official link.
Migrate your Remote Desktop Services Client Access Licenses (RDS CALs)
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/migrate-rds-cals
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Best Regards,
Grace