I cant register in the Zoho Mail service

I cant register in the Zoho Mail service

I been trying to register sicardmex.com but I cant, it says:
This domain is already associated with this account "*****52".

Last friday we try to register but the sms was not able to be used so the process was not completed, and now we cant do a new registration.

Could you please help us?, the URL: sicardmex.com