Document that systemd-sysusers doesn’t create the specified home directory, and point to systemd-tmpfiles as the service that can create the home directory instead. (systemd-tmpfiles-setup.service is ordered After=systemd-sysusers.service, so by the time systemd-tmpfiles would create the home directory, sysusers would have created the owning user already, and it should all work out.)
System and Service Manager
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