DNS Problem: SERVFAIL looking up TXT for _acme-challenge.X - the domain's nameservers may be malfunctioning

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3

I see the CNAME:

_acme-challenge.app.sibroschina.tech canonical name = f1812fa2-256a-4550-810c-cc4567b0f690.auth.sibroschina.tech

But that [long] name doesn't resolve to any IP.

Tried:

nslookup f1812fa2-256a-4550-810c-cc4567b0f690.auth.sibroschina.tech a.ezdnscenter.com
nslookup f1812fa2-256a-4550-810c-cc4567b0f690.auth.sibroschina.tech b.ezdnscenter.com
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