I had thought that this affected my logon, and in a way it did. But after changing my login Password, I couldn't get into my work Windows 10 PC. HOWEVER, I finally tried my OLD password, which let me into the database. At that point neither old nor new password would allow it to Sync... I had the same problem as GM-1 did, above.
So, when I get messages that say it cannot access the Evernote Server, I guess that may be correct.... it won't Sync because my Windows 10 PC cannot communicate with the Evernote Server (which my iPhone and my Samsung android tablet also can do, successfully). Thus, the password that I changed via a browser on a different PC didn't get sent to my work's Windows 10 PC.