Filen cloud cli systemd error 203/EXEC

I tried creating a Systemd service for the cloud service Filen CLI and used this guide: Filen CLI sync: Setup Guide for Linux — infoBAG

My Systemd serivce looks like this:


[Unit]
Description=Filen CLI Sync Service
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/usr/bin/filen-cli-v0.0.27-linux-x64 mount /home/user/Filen/
Restart=on-failure
RestartSec=5
User=root
WorkingDirectory=/root

[Install]
WantedBy=multi-user.target


When i use /usr/bin/filen-cli-v0.0.27-linux-x64 mount /home/user/Filen/ it works without any problem, but the Systemd service always returns 203/EXEC. Already tried giving the file every possible permission, but to no avail.
Anybody got any idea? Still a bit of a noob when it comes to these things.

Your .service file does not match the info in the instructions you linked

Indeed, but the Exec command is just another way of syncing. The command itself works just fine

Restart the service and check the journal:

sudo systemctl restart filen-sync.service
journalctl --no-pager -b -u filen-sync.service