Events not showing

Hi there,
I’ve set up two separate google calendars – one is displaying the calendar events correctly on our site, however the second is not showing any calendar events at all. I’ve checked multiple times to see if there is a difference in the way I’ve set them up, but everything appears the same. Both calendars are set to public. Any ideas would be much appreciated. Thank you

https://wordpress.org/plugins/google-calendar-events/