Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
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I'd recommend reaching out to NFL channel directly to report the issue and request additional support. Many channels on the Roku platform is developed and maintained by the channel provider directly, and they'll be able to best assist.
FYI, looks like NFL released an update to their app - completely redesigned. not liking it so far, but we'll see if RedZone works on Sunday - as I'll be watching that primarily since my Ravens play on Thursday.