Download the Roku app on your phone, connect your headphones to your phone. On the app you want to go to the remote and it will show a headphone button, click that and it should work.
You could use the roku app on iphone and android and use the headphone option.
Connect device to phone bluetooth then press the headphone option.
I purchased an ONN. soundbar. (less than 40$) thru Walmart.
It has Bluetooth which I was able to pair my headphones thru it.
Some of the newer Roku devices with the latest chips now have the capability of sending audio to Bluetooth devices directly. As of November 28, 2023, Roku lists these devices as having this capability:
Roku Streambar®
Roku Streambar Pro
Roku Smart Soundbar
Roku Ultra (models 4800 and 4802)
Roku Ultra LT (model 4801)
Roku Plus Series TV
See this Roku article for details and any updates: https://support.roku.com/article/12210854415383
Rokus other than the specific Roku models mentioned in that article are not equipped to send Bluetooth so this capability cannot be added by a software update. For them you must use the Roku Remote app on a phone or tablet, and connect the Bluetooth audio device to the phone/tablet.
Thank you 🙏 it worked!