Phone Link does not work (text messages) on two Windows 11 Pro machines

The Phone Link app does not work well with my two Windows 11 Pro machines: a 2022 Dell XPS 17 laptop with Intel 12th gen CPU and a Corsair One Pro desktop PC with AMD 5950X. I have the Samsung S22 Ultra phone. Both Windows machines have the same problem: I cannot get/send text messages using Phone Link app, but I can make calls and view the Android apps.

So I contacted Dell tech support. Their tech remotely accessed my Dell laptop and decided the Phone Link could not work. He asked me to install Dell Mobile Connect app on my Dell laptop and Samsung Android phone. It works well. So I am good with the laptop.

Then I contacted Microsoft's tech support. He couldn't remote access my Corsair PC for some reasons. His remote access sessions would stop after a few minutes. So he accessed my Dell laptop instead. He couldn't make the Phone Link app work either.

I am wondering if someone on this forum can help me with the Phone Link app on my Corsair desktop PC. I use the Link to Windows app on the Android phone. The Link to Windows app has all permissions. But the Phone Link wants to send notification to the phone, as shown below. When I click that "send notification" button, nothing happens on the phone.

I just checked, there was a Link To Windows update...

I have the latest versions of Link to Windows and Phone Link apps already.