Hi, I have the same problem as OP. I've moved my domain over and the HTTP version loads fine but the HTTPS version throws up an error. ERR_CERT_COMMON_NAME_INVALID on firefox and SSL_ERROR_BAD_CERT_DOMAIN on chrome. The regular domain has no errors.

Sorry for being a bit inexperienced, but what can I do to fix this? Do I need to set up my own SSL for this domain?