[macOS][In-app browser] Prime Video and other video players stopped working after recent updates

What version of the Codex App are you using (From “About Codex” dialog)?

Codex desktop version: 26.901.51231

What subscription do you have?

pro plan

What platform is your computer?

Mac OS

What issue are you seeing?

Prime Video and other video players no longer play videos inside Codex’s in-app browser on macOS. Playback previously worked, but the problem started approximately two or three desktop app updates ago. I am currently using Codex version 26.901.51231.

On Prime Video, I can open the website and sign in, but attempting to play a title produces a generic playback error. The error links to [Prime Video’s playback troubleshooting page](https://www.primevideo.com/help?nodeId=GU85HKX66NVFNQ9Y).

The same videos play successfully in Google Chrome. YouTube also continues to play successfully inside Codex’s in-app browser, so the problem affects some video players rather than all video playback.

I do not know the exact last working Codex version or the underlying cause.

What steps can reproduce the bug?

To reproduce, open Prime Video in Codex’s in-app browser, sign in, and attempt to play a title.

What is the expected behavior?

Playback should start as it did in earlier versions, but instead it fails with the error described above.

Additional information

No response

Start by reproducing Prime Video playback in Codex’s in-app browser on macOS using version 26.901.51231, then compare the result with Chrome and YouTube in Codex. Done means Prime Video and the other affected players play successfully in the in-app browser without the generic playback error.