This Operation has been restricted. [when enabling mailhosting and adding domain]

This Operation has been restricted. [when enabling mailhosting and adding domain]

Dear Sir/Madam,

When I am trying to enable mailhosting, and adding a personal domain, the following error appears:

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

Would you mind providing any assistance? Since I would like to switch from G Suite to ZOHO for my owned domains.

If any further information is required, please feel free to let me know at any time. Thank you very much.

Sincerely