My DNS-hosting support don’t want to add TXT records with underscores, while they allow to add SRV-records normally.
If I won’t deal with them, can I check vhreg_auth some other way?

Hello,

TXT records are used to ensure you are the owner of the domain. Please contact me via e-mail (.(JavaScript must be enabled to view this email address)) so we can see how to solve this issue. Whats your domain name?

Regards,

Juan Pablo

I gave them a proof link about underscores in subdomains, and they added record manually.