Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
Delete all devices under "Screen mirroring devices" whether they are "always allowed" or "always blocked".
Set the "Screen mirroring mode" to "Prompt".
Attempt a screen mirroring session from a device.
When prompted (be patient, it can take 30-60 seconds), choose "Always Allow" for each device.
If the problem persists, and your wireless network has both 2.4 and 5Ghz band usage, try switching the laptops to connect via 2.4Ghz first, or, switch the Roku to connect to the other band (from 2.4Ghz to 5Ghz, or vice versa), assuming your wireless network has different SSIDs for each band.