AVM FRITZ! DECT 301 + Google Home

Hello,

I have used this example to connect my google home mini for adjusting the target temperatures in my rooms.
Everythings working fine, the value can be adjusted via voice or in the google home app.

The only problem I have at the moment is that the google home replies that he could not connect to the openhab service, in german “Der Anbieter opeHAB ist anscheinend zurzeit nicht erreichbar”

In the openhab log I see the value which is changed…whats wrong here?