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After you’ve been granted GDAP by your customer, confirm you can still perform all necessary administrative activities on your customer's behalf. After that, you can disable your existing DAP connection.
For more information, please also check another documentation page of ours: 🔜 Transition from DAP to GDAP
Lastly, you can find even more detailed information in the Granular Delegated Admin Privileges (GDAP) section of the Microsoft Partner Center.