I've posted about this before. There is no rhyme or reason for it. One moment I can send messages from my Win 10 computer to my Android and the next (literally), I cannot. Both are on the same network.

I cannot fathom how Microsoft could permit such a flaky app to be released.

Sometimes I can't send but if I sent from my Android phone the message does appear on Windows. Sometimes not. Sometimes it says it cannot send and I try again and it works. Sometimes not. (And sometimes not for days at a time).

There is nothing to indicate where the problem is.

Just gripping, I guess.

Windows 10 Enterprise Version 1903