ISP Manager does not allow adding a DNS record with an underscore (_) for DKIM, and the hoster does not want to help - what should I do?

Question

Domain Name System

It is necessary to register DKIM for our domain in the ru zone, we are trying to do this through the ISP Manager.
As a result, we generated a DNS record via https://port25.com/dkim-wizard/ , but ISP Manager does not allow creating a record of the form:

ourselector._domainkey.ourdomen.ru IN TXT

it does not like the underscore _ in this record!

Those. activecloud.ru hosting support does not want to help, says that DNS records with an underscore cannot be added on their hosting!

Can you tell me how to solve or bypass the problem?

ps: We need DKIM for MailChimp...

Answer 1

Change DNS host?

Answer 2

They don't want to, and they do it right. The standards must be followed.
https://tools.ietf.org/html/rfc1738