Gardena smart System with Homekit - no connect possible

Hey Guys,

I’m trying to connect the “Gardena Smart System” to Hassio via the Homekit Option.

So the Autoscan from Hassio finds my System in the Network.
When i try to add it, the System asks for the Homekit-Code.

After i entered the Code and clicked Add, the System tells “Gardena” is already connected to another System.

So I’ve reseted the Gardena-System (Reset all homekit-Connections) above the Web-Platform.
After that, nothing has changed in the Hassio-Platform.
Hassio already tells that the System is already connected to another System.

Has anybody Any Experience with this Option?

Thank You in advance.