Hello @Claus Corlin - Thanks for reaching out.
Can you verify if Reply URL being sent in the request is matching with any Reply URL registered in the app with ID "50f10369-af16-40f0-852b-ec78f3ee07ee".
If its not matching, Please try registering the url as reply URL under the authentication blade of the app and try again.
If the above response helped, please "Accept as Answer" so it can be beneficial to the community.