First of all, how do you mean with tenant migration?
Have you set up a whole new O365/Azure tenant and a new portal for Defender for Endpoint / Microsoft 365 Defender, or do you mean migrating devices to the new M365 Defender portal?
If a complete new tenant, have you setup your machine's to offboard your previous AAD / Intune, and rejoin to the new AAD / Intune?
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