Hi! I’m having the same problem as of this morning - the app on my iPhone works fine with my wifi and so does my Windows PC, but I get that exact message on my iPad. Granted this particular iPad is old, but it has worked previously with Evernote.
What’s really odd is I turned off wi-fi and tried Data but I get the same message!
Glad it’s not just me.
Will post if I find a solution; anyone else have this going on?