Hi @Luka_Eelman,
welcome to the forum 
Sorry, you are experiencing issues. The address, which you are asked to enter in StreamDeck, is shown in the app settings of the integration app. Just above the field where you set the key.
Also, maybe you have done this already, check the FAQs here: Elgato StreamDeck Integration - #2 by Shakesbeard
Let me know if you need further assistance and stay safe!
