repherion

can i add another new domain which is imused.helioho.st

I cant secure webmail. Encountered issues while issuing the certificate for webmail.imusedscholarship.helioho.st Details Invalid response from https://acme-v02.api.letsencrypt.org/acme/authz/2276532566/488463531296. Details: Type: urn:ietf:params:acme:error:unauthorized Status: 403 Detail: 2001:470:1:1ee::1002: Invalid response from http://webmail.imusedscholarship.helioho.st/.well-known/acme-challenge/7d5958ZhAN7mmm-hepdeog5pUjn2rCMAwUZV7vU3wX8: 404

Can i request for change domain name? I need to change my domain name into imusedscholarship.helioho.st instead of repherion.helioho.st