Looks like that is the case. user_friends permission requires application review by Facebook. This requires setting up a test version of your app on the fb dev portal, creating the aforementioned test users, friending them to each other in the settings there, logging in as them in-browser, then logging into your app with them, and creating/testing and functionality set up in your Bubble app to take advantage of fb friends. This then all has to be demo’d for the Facebook review process, and approved for a live production app.
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