I had this issue for a week now ( July 2021 ). On Mac with Big Sur 11.4 - Evernote 10.17.6
At first I waited for Evernote to fix it, as they usually are on top of things. Since it has been a week, I did the whole uninstall properly and reinstall etc.. a number of times.. never worked. I went to the help page to see if there are better ways to uninstall, but it's just what we all know and do..but they do say ' download from our website or the Mac app store'..
Turns out, it was fixed after I reinstalled from the Mac App Store.. not from the download button on the Evernote website.
I thought I'd leave that here for anyone who's struggling with the loop to hell ' something went wrong on our side, please restart evernote ' and then it doesn't quit..so force quit and all that..
Enjoy!