Looks like Roku recently added the 9101 to the DFS unsupported list as it was not on it when I checked last time for a user.
My 9102 does see/use DFS. (or at least it did a couple of weeks ago when I tested it).
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102