Hey @Jan-vK ,
Thanks.
Issue is that the app can’t fetch the Synology MAC address. Therefor it can’t send a Wake-On-Lan.
Make sure you have enabled WOL in your NAS.
DSM → control panel → hardware & power → WOL on lan 1
If you want to use WOL. You can find the mac address here:
DSM → control panel → info center → network → Lan 1 → mac address.
Fill this mac address in the device settings in Homey