Extra characters added to CNAME domain

I set the CNAME subdomain.domain[DOT]com to “mkto‐abcdefgh[DOT]com” (sample given) but it always resolves to “xn–mktoabcdefgh-j09f[DOT]com” with additional characters. Searched Marketo and Cloudflare support and can’t find a reason. Why?

Seems like at least one of the characters in the domain name is punycode/international. That’s the reason for the “xn-” in front.

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