Oddly enough, the video is visible when streaming a YouTube (not YouTube TV) video. This problem occurs when using both Chrome and Safari. I have restarted all devices, and all have been updated. The standard Apple AirPlay support pages offer no solution. No one ever replied with a solution to the post describing the same problem with Hulu in 2020.
In the last few weeks, users have reported an issue where the HBO Max app was not working on Android TV while others complained about the subtitle placement being too high. And now, HBO Max subscribers are reporting (1,2,3,4,5) another issue where they are getting a ‘Can’t Play Title. We’re having trouble playing this video.
The HBO Go site says contact my provider (Uverse) if there is trouble logging in. The number Uverse tech support gave me for HBO Go was their corporate offices, which was useless. I've looked on these discussion boards and I can't find a solution to this problem, although some others have posted similar problems.

If your Apple TV has stopped working on your Firestick, you should consider disabling the firewall on your router. Here’s how to do it; Go to Settings on your Firestick. Choose the Network option and click on Wi-Fi. From the Wi-Fi menu, choose the Advanced option. From the Advanced options list, you will see Proxy.

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