systemd: fails to run service: error failed to get dbus name

My shell script runs fine manually, but causes an error when started by systemd. What is the problem?

I have configured xboxdrv to remap my logitech f310 controller as a mouse on my Raspberry Pi 3B running Buster.

When I run it from the command line as

sudo xboxdrv -D -c /usr/share/doc/xboxdrv/logitech.xboxdrv

It works fine. So I set it up as a service to run at boot. First I put the above into a shell script:

#!/bin/bash
sudo xboxdrv -D   -c /usr/share/doc/xboxdrv/logitech.xboxdrv --silent  & sleep  1

Which I then saved as /usr/share/doc/xboxdrv/logitech.sh and then made executable.

When I run that script with sudo /usr/share/doc/xboxdrv/logitech.sh everything works. So far so good.

Then I make a service file:

[Unit]
Description=start xboxdrv to configure logitech f310 gamepad
After=default.target
[Service]
ExecStart=/usr/share/doc/xboxdrv/logitech.sh
[Install]
WantedBy=default.target

I enable this:

sudo systemctl enable /etc/sysemd/system/xboxdrv.service

and start it:

sudo systemctl start xboxdrv.service

But now I get an error. This is what I get from journalctl -xe:

[ERROR] XboxdrvDaemon::run(): fatal exception: failed to get unique dbus name: 
 Connection ":1.21" is not allowed to own the service "org.seul.Xboxdrv" due to 
 security policies in the configuration file

So what does this mean and why am I getting it? I have no idea why xboxdrv needs this connection? What configuration file is it talking about?

And, more to the point, how do I fix this?

Thanks!