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DNAC will discover the Access point through the wireless controller so should be you add the WLC to fabric site include SNMP, CLI credentials, and also streaming telemetry on WLC after this you will find all the AP's joined WLC through CAPWAP.
Steps to add CLI and SNMP credentials
Steps to enable streaming telemetry on the WL
Login to WLC---> management ---> cloud services --->network assurance --->enable services --->save config