error: "This Operation has been restricted. Please contact support-as@zohocorp.com for further details"

error: "This Operation has been restricted. Please contact support-as@zohocorp.com for further details"

Hi, I am trying to add a domain to my zoho email account. Getting this error -  This Operation has been restricted. Please contact support-as@zohocorp.com for further details.

Please resolve.