user services don't start at login

Question

Operating System: Kubuntu Noble (24.04.02 LTS)

I have 4 services that execute rclone mounts for ftp sites.

$ rclone config
Current remotes:
Name                 Type
====                 ====
subdomain1.domain1.eu  ftp
subdomain2.domain2.net  ftp
domain3.be           ftp
domain4              ftp

The service files are all pretty much the same:

~/.config/systemd/user/rclone_subdomain1.service

[Unit]
Description=RClone subdomain1.domain1.eu Service
Wants=network-online.target
After=network-online.target
[Service]
Type=notify
KillMode=process
RestartSec=5
ExecStart=/usr/bin/rclone mount --config /home/username/.config/rclone/rclone.conf subdomain1.domain1.eu: /home/username/subdomain1.domain1.eu
[Install]
WantedBy=default.target

~/.config/systemd/user/rclone_subdomain2.domain2.net.service

[Unit]
Description=RClone subdomain2.domain2.net Service
Wants=network-online.target
After=network-online.target
[Service]
Type=notify
KillMode=process
RestartSec=5
ExecStart=/usr/bin/rclone mount --config /home/username/.config/rclone/rclone.conf subdomain2.domain2.net:folder/subfolder /home/username/subdomain2.domain2.net
[Install]
WantedBy=default.target

~/.config/systemd/user/rclone_domain3.service

[Unit]
Description=RClone domain3.be Service
Wants=network-online.target
After=network-online.target
[Service]
Type=notify
KillMode=process
RestartSec=5
ExecStart=/usr/bin/rclone mount --config /home/username/.config/rclone/rclone.conf domain3.be: /home/username/domain3.be
[Install]
WantedBy=default.target

~/.config/systemd/user/rclone_domain4.service

[Unit]
Description=RClone domain4 Service
Wants=network-online.target
After=network-online.target
[Service]
Type=notify
KillMode=process
RestartSec=5
ExecStart=/usr/bin/rclone mount --config /home/username/.config/rclone/rclone.conf domain4: /home/username/domain4
[Install]
WantedBy=default.target

All of those services work when executed manually and result in functioning mount points. All of them were enabled with systemctl --user enable <service>.

Now when I boot/log in, I have the domain3.be and domain4 services running. The other 2 haven't been started, according to journalctl. No error messages, no nothing.

$ systemctl --user list-unit-files --type=service
rclone_subdomain1.service                        enabled   enabled
rclone_subdomain2.domain2.net.service            enabled   enabled
rclone_domain3.service                           enabled   enabled
rclone_domain4.service                           enabled   enabled
$ systemctl --user status rclone_subdomain1
○ rclone_subdomain1.service - RClone subdomain1.domain1.eu Service
     Loaded: loaded (/home/username/.config/systemd/user/rclone_subdomain1.service; enabled; preset: enabled)
     Active: inactive (dead)
$ systemctl --user status rclone_subdomain2.domain2.net
○ rclone_subdomain2.domain2.net.service - RClone subdomain2.domain2.net Service
     Loaded: loaded (/home/username/.config/systemd/user/rclone_subdomain2.domain2.net.service; enabled; preset: en>
     Active: inactive (dead)

But systemctl --user start rclone_subdomain2.domain2.net starts the service flawlessly.

I'm out of ideas. Can anyone help me get the two dead services started on login?

Thanks.