Hi Yair,
I'm Sumit, here to answer your query at the Microsoft Community.
Apologies for any inconvenience you are experiencing. I am happy to help you today.
I see it should show a QR code. Can you share a screenshot to understand the problem?
Via
https://support.microsoft.com/en-us/topic/phone...
In the search box on the taskbar, type Phone Link, and then select the Phone Link from the results.
You may be asked to sign in to your Microsoft account if you haven't already signed in with Windows.
Install or open the Link to Windows mobile app on your Android device. To do this, open a web browser on your Android device and then enter the link that's displayed on your PC (www.aka.ms/yourpc).
Sign into the mobile app with the same Microsoft account that you signed in to on your PC.
Once you've signed in, go back to your PC, select the I have the Link to Windows app ready check box, and then select Pair with QR code.
Note: If you'd like to pair your device without using a QR code, select Pair manually on your PC instead. You'll be prompted to enter a code on your Android device.
A popup window with a QR code will appear on your PC screen.
In the mobile app on your Android device, select Link your phone and PC. When asked Is the QR code on your PC ready? select Continue.
You'll be asked permission for the app to access your camera. After accepting, an in-app camera will open. Use this camera to scan the QR code displayed on your PC.
I look forward to your response and am eager to collaborate until we find a solution. Happy New Year!