Cloudmin DNS Services not supported

SYSTEM INFORMATION
Host OS type and version (for Cloudmin) Debian Linux 11
Guest OS type and version: IF APPLICABLE
Webmin version: 6.17
Cloudmin version: 9.5 Pro

I have added a physical machine Ubuntu 20.04 in Cloudmin with Virtualmin freshly installed, and made it a service host through Cloudmin Services, for DNS and DNS secondaries.

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If I try to connect to that same cloudmin master from a Virtualmin for Cloudmin services client I get this:

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After reading https://www.virtualmin.com/hosts/ I tried to reinstall the service machine, with Virtualmin installed through Cloudmin. I registered it as a service for DNS like before and got the same error message. I tried also from a Ubuntu 20.04 client, and same message again