My web search for LC-50LB8601U only finds this post. Did you enter the model correctly? The initial announcement said Airplay support was being added to Rokus supporting 4K - I've not seen anything saying they've extended to lower resolutions, although I could have missed it.
Roku lists the devices below as supporting streaming with AirPlay 2:
Device Model
Roku TV™ | Axxxx, Cxxxx, CxxGB, 7xxxx |
Roku Streambar™ | 9102 |
Roku Smart Soundbar | 9101, 9100 |
Roku Ultra | 4800, 4670, 4661, 4662, 4660, 4640 |
Roku Premiere | 4630, 4620, 3920 |
Roku Streaming Stick®+ | 3811, 3810 |
See these links for help:
Roku page re Airplay 2: https://support.roku.com/article/360057488733
Helpful forum post re getting Airplay to work: https://community.roku.com/t5/Roku-Device-Features-Settings-Updates/Help-setting-up-Apple-Airplay-on...
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
Note: I am not a Roku employee.
