I have an issue with screen mirroring. I two devices that I have tried to mirror with the same results.
Samsung Galaxy S10+
HP Windows 10 laptop.
I have two Roku TV's that I got for Christmas. Did have 2 Roku 3's and was able to mirror both of the above devices.
43" TCL 4K UHD Roku TV
50" TCL 4K UHD Roku TV
Steps to recreate:
Roku Mirroring options: Device Connect Enabled, Screen mirroring mode is Prompt, Allowed devices are [Phone] Galaxy S10+ and George Worley (My HP Laptop)
I start the connection process from either device. Both the phone and the laptop see both TVs and I am able to start the connection,
The Roku TV launch an app called RokuCast (name on the icon however from the Home page if I use the * button while I am on the Roku app the full name is RokuCastr version 126.96.36.199 Build 0. If I remove the channel and try to mirror again the Roku TV acts like it is a private channel and doesn't list Roku is the developer (Jpad) with a version of 1.2 with Dec 28, 2015 as the release date and only list the name is RokuCast. If I add the channel back it is a private channel. Not sure how this has happened. I delete it and it keeps coming back.)
Is there some setting that I am not seeing that causes a default app to launch when one tries to mirror their device.