DNS: cname wildcard entry subdomain with hyphen

I am trying to make a wildcard cname entry on my dns provider as follows: *-abc.[domain].com or even *abc.[domain].com but it does no work.

If i do *.abc.[domain].com then it will work but I don't want to use dot. I am using hyphens as opposed to dots as I have a wildcard SSL certificate so all "levels" are covered.