I recently encountered a streaming issue with the Twitch app while streaming from my Xbox Series X; I was able to resolve it with trial and error following the steps explained in this post, which may prove to be useful to you if you are getting an error code D43177F3
Kindly follow the below instructions if you cannot stream on your Xbox One/ One X/ Series X due to error code D43177F3 on the Twitch App installed on the console.
1) log in to your Twitch account from a laptop/computer, go to the settings menu, disconnect the Xbox console connection currently active under the connections settings from your ID
2) If you have the two-factor authentication set up already for your Twitch account, disable it temporarily from the Security and Privacy option under the settings menu. If you don't have this set up yet, please do enable it
3) Sign out from the Twitch App on your Xbox console, uninstall the Twitch app, and restart the console.
4) log in to your Twitch account from your laptop/computer again. Enable the two-factor authentication again, which you had disabled last time; if you had configured two-factor authentication for the first time earlier, you don't need to do anything with this setting again.
5) Install the Twitch app on your console again, log in with your Twitch ID on the Xbox, and you should be able to start streaming again
I tried following the troubleshooting steps shared on this Twitch support page, but none of the steps recommended work. I had reset my Xbox Series X to factory settings with no luck; however, disabling the 2FA (two-factor authentication) and re-enabling it again helped me resolve the streaming issue I was facing.
Leave a comment on my post if you found it helpful!