Just as a follow-up; I've managed to fall into this trap again, attempting to authorize the keys by adding them to the 'authorize-keys' field of guix-configuration record.
On the local machine: --8<---------------cut here---------------start------------->8--- guix offload test /etc/guix/machines.scm 127.0.0.1 guix offload: testing 1 build machines defined in '/etc/guix/machines.scm'... guix offload: Guix is usable on '127.0.0.1' (test returned "/gnu/store/883yjkl46dxw9mzykykmbs0yzwyxm17z-test") guix offload: '127.0.0.1' is running GNU Guile 3.0.0 sending 1 store item (0 MiB) to '127.0.0.1'... exporting path `/gnu/store/l9mph3k5l26nm8mb50imsklbsz0bji0b-export-test' guix offload: error: program `/gnu/store/amjsgks2n05k9lkck78z64nphad1dkqr-guix-1.0.1-13.50299ad/bin/guix' failed with exit code 1 --8<---------------cut here---------------end--------------->8--- On the remote machine: --8<---------------cut here---------------start------------->8--- sudo strace -p 15683 -p 15716 -f -s345 -o /tmp/log --8<---------------cut here---------------end--------------->8--- And found within /tmp/log: 16120 write(2, "guix authenticate: error: error: unauthorized public key: (public-key \n (ecc \n (curve Ed25519)\n (q #MY-PUBLIC-KEY#)\n )\n )\n", 176) = 176 So, still actual :-) Maxim