Currently your site does userAgent sniffing on page load, which is a web anti-pattern (see https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent, https://css-tricks.com/browser-detection-is-bad/, https://www.sitepoint.com/why-browser-sniffing-stinks/ and plenty of other resources). After all, a user can just override the user agent string.

Instead you should use feature detection to either shim when a feature is unavailable or then block until that browser supports the feature.

For the record - the app works fine in Edge with a userAgent that tells you it's actually Chrome.