DCTL1019

variable contains invalid character

Template variable contains invalid characters. Valid characters are the following:

0123456789-_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

It is best to avoid hyphen - and underscore _ as leading or trailing characters.

See also https://www.ietf.org/archive/id/draft-ietf-dconn-domainconnect-03.html#name-template-record