The day that the Companion app updated, I was able to view my PSN friends list. But later that night, it went right back to being unable to load?
This is a problem with how PSN authentication works. Not only do you need to be logged in with your PSN credentials to see your PSN friends, but your PSN session will expire after a certain amount of time despite still being logged in to Bungie.net. This is not something we have much control over and are looking into ways to alleviate it, but for now if you really want to see your PSN friends you will have to log out of the app and log back in.