Thursday night football on Amazon Prime

While using the Prime Video App through Xfinity, the pause/rewind/fast forward are disabled. This has been going on for 2 years and it's still not fixed. I am so frustrated paying 2 subscriptions (Xfinity Amazon Prime) and the NFL Thursday Night football game doesn't function properly. Why does it work on computers and other app but via Comcast box and Prime Video it doesn't. Please fix it!!