Did you enroll in the cloud console? If so, that's why. This is now managed by the cloud console.
See here:
https://help.symantec.com/cs/saep/SAEP/v123362243_v118537647/What-happens-after-you-enroll-a-Symantec-Endpoint-Protection-domain-into-the-cloud-portal?locale=EN_US
You ...