I just found a msg under forum Evernote for Android Issues (Versions 10.0 and above) entitled Android Thinks I'm A New User Sept 28 by SCLOUGHLEY that describes something that happened to me prior to losing all my data.
The problem exists on my Android Samsung S20 cell and my Dell Notebook using Microsoft. I use my cell mostly and update Evernote every other day. So one day everything was there and then 2 days later everything was gone, all notebooks and all notes.
New on forum but desperately need help/advice. Opened my account this week and everything was gone. I am in dire need of having it restored but cannot contact customer service and phone nbrs no longer in service.