Blynk server startup RPI3 with Systemd won't start

I have the local server running on my RPI3 no problem, but manually.

I tried going from an example file, put it in /etc/systemd/system and called it blynk.service - and set it up with “systemctl preset blynk service” then rebooted. nothing. Here’s the file. Any help really appreciated.

[Unit]
Description=Starts and stops the Blynk server daemon

[Service]
WorkingDirectory=/home/pi/blynk
User=blynk
Group=blynk
Restart=on-failure
RestartSec=10

ExecStart=/usr/bin/java -jar /home/pi/blynk/server.jar -dataFolder /home/pi/blynk

[Install]
WantedBy=multi-user.target