Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Acorn's website indicates it IS available in Denmark. That's the first part of the equation.
The individual channels provide their channel apps, Roku just provides the platform on which to run them. The second part of the equation is whether Acorn has provided Roku with a channel app that is coded to allow operation in Denmark. I'm in the US and don't have any way to determine this. If they have not provided one yet, you should be able to watch on a computer via a web browser.
Unfortunately Roku has NO search option in Denmark , wich is a great disgrace , unbelievable you are not able to make a search thru programs but have to scroll all is a waste of time - as for now i have trashed the Roku player here as it is of no use in 2021 without a search function!