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I have the same issue, same Roku model. AirPlay works just fine. Mirroring using Windows or Android (Sansung Smartview), does no work on my Roky Premiere. Mirroring works fine with my Sansung TV (Windows, Android or Airplay), on the same network.
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Hi @serlcb,
Thanks for posting here in the Roku Community for help today!
We appreciate you informing us about this concern you've encountered with screen mirroring not connecting, We would be more than glad to assist, and you can follow these steps provided below to resolve the issue.
Kindly verify screen mirroring of Roku is configured or working properly:
- Settings/System/Screen mirroring/Screen mirroring mode=Prompt
- Settings/System/Screen mirroring/Screen mirroring devices/Always blocked=none
- Settings/System/Advanced system settings/Device connect=Enabled
- Settings/System/Advanced system settings/Control by mobile devices=Default
- Always select "Always allow" when prompted by the Roku
- Test with (another) Android/Windows Miracast-capable device
One additional step you can do after performing all these steps is to restart your Roku device by navigating to Settings > System > System Restart.
Please keep us posted on how it works.
All the best,
Kash
Roku Community Moderator

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Hi @serlcb,
Thanks for posting here in the Roku Community for help today!
We appreciate you informing us about this concern you've encountered with screen mirroring not connecting, We would be more than glad to assist, and you can follow these steps provided below to resolve the issue.
Kindly verify screen mirroring of Roku is configured or working properly:
- Settings/System/Screen mirroring/Screen mirroring mode=Prompt
- Settings/System/Screen mirroring/Screen mirroring devices/Always blocked=none
- Settings/System/Advanced system settings/Device connect=Enabled
- Settings/System/Advanced system settings/Control by mobile devices=Default
- Always select "Always allow" when prompted by the Roku
- Test with (another) Android/Windows Miracast-capable device
One additional step you can do after performing all these steps is to restart your Roku device by navigating to Settings > System > System Restart.
Please keep us posted on how it works.
All the best,
Kash
Roku Community Moderator
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Re: Can't mirror Samsung S20 screen on Roku Premiere 3920RW using Smart View
Dear @RokuTakashi
Already tried all of these, but, mirroring with AirPlay works just fine. But with Windows or Samsung (S20 and S23) don't.
Thanks for your reply.
Sérgio
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Re: Can't mirror Samsung S20 screen on Roku Premiere 3920RW using Smart View
I can't mirror my Samsung S9 to Roku anymore. This started in the last couple of weeks. I tried the suggested problem solving with Roku settings, and it didn't help.

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Re: Can't mirror Samsung S20 screen on Roku Premiere 3920RW using Smart View
Hi @sammy15,
Thanks for reaching out here in the Roku Community for assistance today!
We understand that you're unable to connect to the Screen mirroring using your Samsung mobile device, and we'd like to investigate more about this. Could you please provide your Roku device information, such as Device ID, Serial Number, and Model Number? All these can be found in Settings > System > About.
In addition, we'd like to know what is the OS version of your mobile device, and if you are using an app to connect to the screen mirroring? If so, what app is it?
We look forward to hearing back from you.
All the best,
Kash
Roku Community Moderator
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Re: Can't mirror Samsung S20 screen on Roku Premiere 3920RW using Smart View
Hi Kash. Sure. As follows:
Model - 3930CA - Roku Express
Serial Number - X004004YNUG0
Device ID - S014298YNUG0
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Re: Can't mirror Samsung S20 screen on Roku Premiere 3920RW using Smart View
Samsung S9. Using Smartview icon to connect.

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Re: Can't mirror Samsung S20 screen on Roku Premiere 3920RW using Smart View
Hi @sammy15,
Thanks for the update and for sharing with us the necessary information about this.
We'll forward this to the appropriate Roku team for further investigation. Once more information is available, we'll be sure to update this thread.
Just get back here with the Roku team if there's anything that you want to address.
Thanks,
Rey
Roku Community Moderator