Can't watch live, can watch recorded

I have this older laptop and Windows 10 with the Tablo app from the MS app store. My Tablo is remote (friend’s house with good antenna). When I open the app, I can watch recorded channels, but not live TV. No error, but when I click on a channel, I get a black screen with a play button on bottom which doesn’t do anything.

FWIW, I also have the Tablo app on my iPhone same ocation, same wifi, and that works fine. Any ideas whats wrong and howto fix?

Are you using the Tablo app found in the Windows 10 store? Or are you accessing the Tablo remotely using a web browser at