Hi I have the same problem, I think it was because I reinstalled Windows without unlink the device, so my old connection is still registered in my Microsoft account. But I do not see it under my device in my Microsoft account (it only shows Windows device).
So when I relink my phone, it link as a new connection, and the old link is shown disconnected. I tried reset both phone and windows app, But as soon as connect the duplicate will show again.
I believe the issue is somewhere in Microsoft account still has the record of the old connection