Everspring SM103 contact alarm not sensed in Everspring App

I want to use my Everspring SM103, I have added the Everspring app and the SM103 device can also be added. But in Homey the contact on/off is not sensed.
I have tried both the latest stable Everspring app, and the latest experimantal version. No luck for both versions.
The device does work, because I also have an Zipabox, where it does work like intended.
What can I do to solve the issue ?
Thanks for the help,
Theo