Google Maps not working on sites using widget

We have a hub calendar and for all sites using the widget, the Google maps are not working. I have added each of those site URLs to my API, but the map displays for about a second, then disappears. I’ve read numerous help articles about adding the referring URLs to fix this, but I can’t make it work.

https://www.showlowchamber.com/calendar (main site)

https://themaverickmagazine.com/event-calendar/#event|white-mountain-chorale-handels-messiah|4031
https://pinetoplakeside.com/event-calendar/#event|5th-annual-benefit-christmas-in-the-pines-concert|4536