I own 3 Roku Stick +, in one of the device i can't do Screen Mirroring from any device(i can't see the Roku device on my Iphone / Macbook) . The same iphone works well with other two Roku i got. The only difference i see is that the two functional units are showing Model 3810X and the one that the screen mirroring doesn't work the Model is 3810RW , do you think this might be the problem
Interesting - I though earlier versions of the chart showing airplay compatibility (and ones copied into threads here) explicitly said the 3810X, but now they've dropped the letter qualifiers. Maybe that means the RW would work if you did a factory reset and updated again.
I will have to try the factory reset because nothing I have tried works. I also updated my phone and ipad to ios to 14.3. What's driving me nuts is you select HOMEKIT on the Roku it displays the 8 digit code and BARCODE and I can scan with phone and it tries to find and connect but fails after a few minutes.