Problems getting past a black screen during a road trip

Gives me a black screen on loading. I have an iPhone X. It’s not working with it.

Update: OK it finally loaded so I can look up film I wanted to look for. Naturally HBO doesn’t have it. But at least I was able to finally get to the program after the black screen was interfering.

MizMM about HBO GO: Stream with TV Package, v10.3.0