I am facing same problem on desktop app on Windows. Can't create or edit create a new note. Evernote app version I am using -
(10.28.3-win-ddl-public (3151)
Editor: v138.1.17456
Service: v1.45.0)
I was planning for EN subscription but changed my mind when I came to know that Outlook calendar is not integrated. EN calendar will be useless for most people without Outlook calendar integration.