Initially when users start using Brave, a plugin/extension called Widevine is not installed with it. Which means that users are unable to use Brave for streaming services such as HBO and Netflix. However, Brave gives the users the option of installing that extension.
After doing so myself, I navigated back to Netflix and HBO. Netflix worked, while HBO still does not work. However, HBO no longer gives me an error message like it used to before installing Widevine. Instead, I just get a black screen that keeps loading indefinitely.
Note: I am using hbo nordic. https://en.hbonordic.com/
Running on Windows 10. Brave Version 0.66.101 Chromium: 75.0.3770.142 (Official Build) (64-bit)