Watch Xbox DVD from another region?

I came back from the United States nine months ago. I bought an Xbox One S there. Now I would like to watch films on this Xbox that I bought in Germany. However, I keep getting the following error message: The disc can't be played. The disk is intended for region 2 and the console for region 1 (0x91d70005).

All my accounts are set to the region Germany (Microsoft, Xbox live and the console)

an external drive would be available if that helps

I preferred the "PC" solution; then use a region-free player such as The DVDFab player