I've used the Smart View feature on my Samsung Galaxy S20 Android phone to mirror/cast my phone screen to my Roku 4K Streaming Stick many times. Now, my Smart View detects and displays the Roku Streaming Stick, but when I click on Start Mirroring. it never connects. I tried removing my phone from the devices allowed and turned the TV off and on, but no luck.
I can mirror to the LG TV fine by choosing it (LG Web OS UN7000) rather than the Roku so I know it's not a WiFi problem. Both the LG Web OS and Roku did updates recently so I assume one of those updates is to blame. I much prefer the Roku remote to the fussy LG remote so hope someone can suggest an easy fix.