After enabling the ADS service for Citrix Endpoint Management mostly we would need to try enrolling a device to validate the ADS is enabled. Alternatively, we could verify the same in a different way.

Instructions

1. Browse to the appropriate ADS domain path.
2. Enter the UPN for which we need to verify the ADS and check the output.
3. If Autodiscovery is enabled, we would receive the following output:

{"adminUsers":null,"domainName":"xxx.com","requireCertPinning":false,"plainTextRepresentation":"example.xms.com;443;zdm;true;false;false;false;false;0;8443;1;true;80;;EMAIL;false;false;true;xxx.com","authorizedEmail":null,"appcAGUrl":"","requireTrustedCAAppc":false,"createdBy":null,"displayReenrollLink":true,"domainType":"EMAIL","updatedBy":null,"useSSL":true,"clientCode":"","instanceName":"zdm","portNumber":443,"createDate":1347566400000,"lastUpdate":1491434193000,"notes":null,"promptDelay":0,"useProxy":false,"userOnlyFromExchange":false,"noStrongId":false,"noCELSP":false,"iosEnrollmentPort":8443,"requireTrustedCA":true,"httpPortNumber":80,"pubCerts":null,"id":72,"hostName":"example.xms.com","protocolVersion":1,"status":1}

4. If ADS is not enabled we would receive the following: 

{"plainTextRepresentation":"1020;No record found","showStackTrace":false,"errorMessage":"No record found","stackTrace":null,"errorCode":1020,"cause":null,"message":null,"localizedMessage":null,"suppressed":[]}

How to verify if Auto-discovery is enabled for a domain.