Warning and message, no errors but I did deactivate WP Optimize and Disabled Jquery Migrate just to see if I could get the button to work, no luck, same result.
I just now also tried deactivating a slew of plugins trying to find a culprit, no luck.
DevTools failed to load SourceMap: Could not load content for /plugins/wp-optimize/css/wp-optimize-global-3-1-8.min.css.map: HTTP error: status code 403, net::ERR_HTTP_RESPONSE_CODE_FAILURE
JQMIGRATE: Migrate is installed, version 3.3.2