Hi Karoline,
It seems that you’re using the microflow as a datasource.
What the error is saying is the input parameter used here is not available. You can only use this if you have context of this object via say a dataview.
Additionally, you’re using show page and also returning the list. If its a datasource microflow, you don’t have to show the page as the microflow will load the data once the page is opened.
Hope this helps!