Still encountering this as of Apr. 1, 2020. Disappointed to see it not having been fixed for over three months.
Was trying from Hong Kong and able to connect my Evernote account to MyEvernote, so firewall should not be an issue.
Also noticing that the MyEvernote icon in the WebView's menu is a black square instead of the elephant logo.
The only workaround seems to be manually opening the article in a PC browser and creating a new note using whatever means (copy-pasting or web clipping as you like).