Sorry for the necromancy but I think this might help future folks googling this issue... You can just run launchctl blame <pid> and it will give you the domain and label. e.g. % launchctl blame 8094 Unrecognized target specifier, did you mean gui/<uid>/homebrew.mxcl.skhd Usage: launchctl blame <service-target> <service-target> takes a form of <domain-target>/<service-id>. Please refer to `man launchctl` for explanation of the <domain-target> specifiers. This works for system domain things also: % launchctl blame 619 Unrecognized target specifier, did you mean system/com.canonical.multipassd Usage: launchctl blame <service-target> <service-target> takes a form of <domain-target>/<service-id>. Please refer to `man launchctl` for explanation of the <domain-target> specifiers.

Same problem here on my m2max.