Who has a working Shelly binding on Synology docker?

Who can help me with this?
I’m running OH3.1 but assume there is no difference with OH2.x
It look’s like a problem related to DNS (shellyplug-s-b50ad5 not accessable; Italic part is my device)
The shelly binding detects the shelly devices in my case shellyplug-s-b50ad5 and all attributes are correct shown.
The problem is that a device never comes online.

Opening a new topic just because there was no solution in the older one is a really bad idea.
Please close this one.

Not sure if this is the correct way to close the topic.