First I installed the ios app IKEA Home Smart and paired the Dirigera bridge. When the app asks just scan the smaller QR code in the box on the back of the device.
Second I started the ios app Home and let it find the device.
Third Home Assistant found a new device: Dirigera and asked for the code.
I tried to pair with the 8 digits on top of the smaller QR code and it did not work.
Fourth I pressed the Reset button on the back of Dirigera and waited until it rebooted.
Now pairing worked with these 8 digits. No hyphen!
Hope I did not forget a step 
Matthias
