When we’ve seen this happen before it was either a) the JSON API wasn’t active on the site, which shouldn’t be the case since you have WordPress 4.6. or b) there was a JavaScript error on the page caused by another plugin. Can you check for any JavaScript errors in the browser’s console?
I know it’s been a while, but I’m writing to let you know that we have released our Attendee Mover/Reassignment add-on for Event Espresso 4 and it is now available in our store: https://eventespresso.com/product/eea-attendee-mover/
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