Microsoft has a recommended workflow for the transition from DAP to GDAP:
1. Audit existing DAP connections.
Find out how partner agents within your organization access customer tenants through DAP using the DAP monitoring tool: Partner Center > Account settings > Security Center > Administrative relationships.
2. Remove inactive DAP connections.
Review the active and inactive DAP connections using the monitoring tool. Microsoft recommends removing any inactive DAP connections as soon as possible.
3. Begin planning for your transition.
Understand what administrative activities your partner agents perform in the customer tenant to determine which GDAP roles will be most applicable.
4. Transition to GDAP.
Begin your transition to GDAP by following the instructions in the Step-by-Step Guide: Transitioning to GDAP of the Microsoft Partner Center. This process will require your customer to approve the GDAP request.
5. Disable DAP.
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.
Detailed information is provided in the Granular Delegated Admin Privileges (GDAP) section of the Microsoft Partner Center.