Hello, Matt Fendt
Welcome to the Microsoft Community.
Hello, thank you for your feedback on this issue, it seems you are encountering
A situation where your computer cannot recognize your computer as a wireless display.
First of all thank you for sharing the information, it seems that win11 can be recognized but win10 computers can not connect, this situation is generally related to driver incompatibility. You can first make sure that the driver of the win10 computer is updated to the latest version, especially the wireless display driver and the graphics card driver and the Bluetooth driver. After this, refer to the steps below to ensure that the connection method etc is checked.
- Check the display Settings of the Fire TV Stick
Make sure your Fire TV Stick is set to allow screen mirroring:
On the Fire TV Stick, go to Settings.
Find Display & Sound > Enable Display mirroring.
Set it to on or mirror mode to make sure it is not set to disable.
- Make sure wireless display is enabled in Windows 10
Sometimes, even though Miracast is supported, it may not be enabled or recognized correctly. You can manually enable:
Go to Settings > System > Project to this computer.
Select available anywhere or available anywhere on a secure network.
Under Ask every Request projected to this computer, select Ask only the first time or Ask every connection request.
Make sure the wireless display is installed from the Microsoft Store:
Go to Settings > Apps > Optional Features.
Scroll down to see if the wireless display is listed. If not, click Add Feature and search for wireless display.
Restart the system after installation.
- Check Miracast compatibility
Although you confirm that your system supports Miracast, sometimes there may be compatibility issues with specific graphics cards or drivers. You can confirm again by following these steps:
Press Win + R, type dxdiag, and press Enter.
Click Save All to save the text file to your desktop.
Open the file and look for Miracast: Available, with HDCP.
If HDCP is displayed or not available, your system may be completely incompatible with Miracast, or there may be a problem with your graphics card or Wi-Fi driver.
- Use the Windows 10 Connect app
Even if you've tried Win + K, the connecting app itself may provide more detailed error messages:
Open the Start menu, search for and open the connected app.
Check to see if your Fire TV Stick appears in the list.
If not, re-enable Miracast, restart both devices, and try the connection again.
- Check for conflicting programs or services
Sometimes background processes or security software may block the connection. Please ensure the following:
Temporarily disable third-party antivirus software or firewalls, even if you have disabled Windows Firewall.
Turn off other applications that may take up network resources (such as VPNS or high-bandwidth applications).
- Reset the Fire TV Stick
If nothing else works, you can try restoring the Fire TV Stick to factory Settings:
Go to Settings > My Fire TV > Restore factory Settings.
Then re-enable screen mirroring, as described in step 1. This clears Settings or configurations that may cause connection problems.
In addition, you can also refer to the following Amazon support forum shared some content that seems to be similar to your problem:
I want to cast from my PC to the Fire TV Stick connected to my Smart TV.
It is also recommended that you consult the TV manufacturer to see if your computer driver version is compatible with your TV for wireless projection.
Disclaimer: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
Best regards
Bobhe | Microsoft Community Support Specialist