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.
System Compatibility & Digital market: US, UK, & CA:
Compatible with Roku Stick, Roku TV HD, & Roku 4k (gen. 3 and up).
That may be accurate, but it's not very helpful because most people don't know what generation their Rokus are. The 3400 is 2nd generation, released back in 2012, and so is not on Peloton's list of the Roku models they created their app to be compatible with.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T