Opsgenie notification doesn't works at Checkmk 2.0.0p3 @ json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[jmelega (Juraj Melega)]

I have created other environment. I am running docker container on the host within VirtualBox.
There I have created notification to Opsgenie under global notification, but with same result. Notification is falling as well.

There are affected different hosts/services.

Note: We are using the “Rest API HTTPS over JSON” integration in the Opsgenie.