What were you trying to do that didn't work? Unable to setup headless session to start at boot for specific users

Please provide the package NVR for which bug is seen:gdm-47~alpha-4.el10.x86_64.rpm

How reproducible:100%

Steps to reproduce

1. install gdm
2. setup headless session
3. systemd enable gnome-headless-session@testuser

Expected results: service enabled

Actual results:

The unit files have no installation config (WantedBy=, RequiredBy=, UpheldBy=,
Also=, or Alias= settings in the [Install] section, and DefaultInstance= for
template units). This means they are not meant to be enabled or disabled using systemctl.
 
Possible reasons for having these kinds of units are:
• A unit may be statically enabled by being symlinked from another unit's
 .wants/, .requires/, or .upholds/ directory.
• A unit's purpose may be to act as a helper for some other unit which has
 a requirement dependency on it.
• A unit may be started when needed via activation (socket, path, timer,
 D-Bus, udev, scripted systemctl call, ...).
• In case of template units, the unit is meant to be enabled with some
 instance name specified.