Hi Ruben, first step to solve it, is to learn danish, so you can use the video 
Did you follow ALL the steps in @Flag 's guide here: GitHub - FlagX/ha-ledvance-tuya-resync-localkey: pyscript for homeassistant to resync local keys from private tuya api
I think you are missing some credentials.
It is credentials for your LEDVANCE account you should enter.
The next post with the update is here: LEDVANCE integration - this is how to do it as per 08/22