My domain registration with zoho email was not completed due an error, how can i continue with the setup?

My domain registration with zoho email was not completed due an error, how can i continue with the setup?

i setup   grupofe.com.gt,  after entering the verification code from the phone the webpage shows something like "server error", now i can´t continue with the setup,  i get an the domain is invalid or already registred..

what can i do¡?