Error message saying "This Operation has been restricted. Please contact support-as@zohocorp.com for further details" while signing up

Error message saying "This Operation has been restricted. Please contact support-as@zohocorp.com for further details" while signing up

Hi,

While I am signing up for the lite version of Zoho Mail, I get this error message saying, " This Operation has been restricted. Please contact support-as@zohocorp.com for further details. "

Is this a problem with my domain, or something else? My domain is www.fgmx.ml.

Thank you, and please try to respond as soon as possible.