Hello, I am having the exact same issue, except on MacOS 10.13.6 High Sierra. I was unable to login to the app, so I tried all suggestions:
- deleted the app and all data (including database) using App Cleaner
- reboot
- reinstalled from Evernote web download (not app store)
- changed password via web.
When I try and login I get this message after entering my email address: "There was an error validating e-mail (xxxx@yyyy.com)"
Login works fine on IOS app and web login. Any suggestions much appreciated!