How to "fix server can't find external_domain: SERVFAIL" inside pod

Hello! I am using DO managed Kubernetes and I’ve met the following problem: My services try to send a request to sgx.geodatenzentrum.de but instead of a response, my service gets an error. Here is nslookup output:

nslookup sgx.geodatenzentrum.de
Server: 10.245.0.10
Address: 10.245.0.10:53
Non-authoritative answer:
Name: sgx.geodatenzentrum.de
Address: 141.74.48.40
** server can't find sgx.geodatenzentrum.de: SERVFAIL

Then I tested this domain on my own laptop and everything was fine:

nslookup sgx.geodatenzentrum.de
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: sgx.geodatenzentrum.de
Address: 141.74.48.40