My choice of browser is Microsoft Edge, because I like its news posts. I have been using Microsoft Edge about a year so far. Microsoft Edge had been syncing normally on my Ubuntu PC, but now I have a sync issue. See my sync is grayed out.
The solution for this issue was simply sign out and sign in again. After then, I lost all my password settings. Please aware of it before you sign out from Microsoft Edge. Now, Microsoft Edge sync again.