Systemctl - Failed at step Group spawning - raspberry-pi3

Question

I have a problem with automatic running of service. I would like to run a script after user login. Once I have succeeded, however when I tried to automatize it, I'm getting an error and I can't find a mistake.
Service:
Description=Service desc
[Service]
Type=oneshot
Environment=DISPLAY=:0.0
Environment=XAUTHORITY=/home/albert/.Xauthority
Environment=HOME=/home/albert/
User=albert
Group=albert
RemainAfterExit=true
StandardOutput=journal
ExecStart=/home/albert/.startup-script.sh
[Install]
WantedBy=default.target
location:
/home/albert/.config/systemd/user/startup-service.service
permissions: -rw-r--r-- 1 albert albert 306 Jan 2 14:49 startup-service.service
Script
Permissions: -rwxr-x-r-x 1 albert albert 86 Jan 2 13:30 /home/albert/.startup-script.sh
Log
Jan 02 17:03:27 irpi-epsilon systemd[734]: Service desc
-- Subject: Unit UNIT has begun start-up
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Unit UNIT has begun starting up.
Jan 02 17:03:27 irpi-epsilon systemd[1025]: startup-script.service: Failed at step GROUP spawning /home/albert/.startup-script.sh: Operation not permitted
-- Subject: Process /home/albert/.startup-script.sh could not be executed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The process /home/albert/.startup-script.sh could not be executed and failed.
--
-- The error number returned by this process is 1.
Jan 02 17:03:27 irpi-epsilon systemd[734]: startup-script.service: Main process exited, code=exited, status=216/GROUP
Jan 02 17:03:27 irpi-epsilon systemd[734]: Service desc
-- Subject: Unit UNIT has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Unit UNIT has failed.
--
-- The result is failed.
Jan 02 17:03:27 irpi-epsilon systemd[734]: startup-script.service: Unit entered failed state.
Jan 02 17:03:27 irpi-epsilon systemd[734]: startup-script.service: Failed with result 'exit-code'.
I have called:
systemctl --user daemon-reload
systemctl --user enable startup-script.service
systemctl --user start startup-script
And I'm trying to do it on Raspberry Pi 3.
Thanks a lot for pointing me at any direction.

Answer 1

If somebody has similar problem then just remove
User and Group from service file. I don't know why, but without them it works pretty well. So the final working service description is:
Description=Service desc
[Service]
Type=oneshot
Environment=DISPLAY=:0.0
Environment=XAUTHORITY=/home/albert/.Xauthority
Environment=HOME=/home/albert/
RemainAfterExit=true
StandardOutput=journal
ExecStart=/home/albert/.startup-script.sh
[Install]
WantedBy=default.target