Hi Guix! Since commit d2b3400f79ffaed3357650307376ab69a7ec3b1b, ssh-daemon fails to start when the system is using shepherd 0.9.1, but has no support to IPv6. This is a result of shepherd trying to listen on a IPv6 address without prior checking.
See https://issues.guix.gnu.org/55335. PS: Yeah, I know, it's 2022 and in a few months it will be 2023 and everyone's toilet should have its own IPv6 address by now and report its users health conditions to a plethora of pharmaceutical advertisers. Nonetheless, in this backward corner of the Earth there is still one guix machine without IPv6, believe it or not! :D