Unable to add domain: This Operation has been restricted. Please contact support-as@zohocorp.com for further details

Unable to add domain: This Operation has been restricted. Please contact support-as@zohocorp.com for further details

Hi,
I'm unable to add my domain "myairtel.store" in my zoho mail cpanel. It shows the message "This Operation has been restricted. Please contact support-as@zohocorp.com for further details"

How do I add my domain?