If you encounter the following errors when creating an event in the Event Builder or when registering, (Queueable Failed Unauthorized endpoint, please check Setup->Security->Remote site settings. endpoint = https://app.pendo.io/data/track and Queueable Failed Unauthorized endpoint, please check Setup->Security->Remote site settings. endpoint =) you will need to add the two sites to your Remote Site Settings, as detailed in these directions:
Navigate to Setup > Remote Site Settings.
Click New Remote Site.
Enter Pendo as the Remote Site Name.
Enter https://app.pendo.io as the Remote Site URL.
Click Save & New.
Enter Google Maps as the Remote Site Name.
Enter https://maps.googleapis.com as the Remote Site URL.
Click Save.