DNS problem: SERVFAIL looking up A , AAAA

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My domain is: бухгалтерия67.рф. (бухгалтерия67.рф)

I ran this command: I use GitHub - unixcharles/acme-client: A Ruby client for the letsencrypt's ACME protocol. to obtain certificates using the HTTP challenge

It produced this output: https://acme-v02.api.letsencrypt.org/acme/chall/1226113/436872968347/HCY_Zg

My web server is (include version): nginx

The operating system my web server runs on is (include version): Ubuntu Linux 20.04

My hosting provider, if applicable, is: Qrator

I can login to a root shell on my machine (yes or no, or I don't know): yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): yes

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): GitHub - unixcharles/acme-client: A Ruby client for the letsencrypt's ACME protocol.

I don't see any DNS issues with this domain, for example Dig web interface - online dns lookup tool .

But I got errors:

DNS problem: SERVFAIL looking up A for бухгалтерия67.рф - the domain's nameservers may be malfunctioning; DNS problem: SERVFAIL looking up AAAA for бухгалтерия67.рф - the domain's nameservers may be malfunctioning

May you help me please to resolve this issue?

See:
бухгалтерия67.рф | DNSViz

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