The DVR was in effect for last night's game, it just isn't very good. I set the game to record and I was able to start at the beginning, but each time I stopped watching I had to start over at the beginning and fast-forward, since there is no resume option. And while you are fast-forwarding you can't see the content you are skipping over as you can with a DVR or with most streaming apps. You can only skip in 10-second increments, which is very tedious and cumbersome.I believe the DVR doesn't start until the Sept. 15 game.
I tested on both my Samsung smart TV and Roku Ultra and got the same results. On the whole, it's a poor excuse for DVR functionality.