They've had their enterprise signing certificate revoked. https://seekingalpha.com/news/3427520-apple-banning-facebooks-info-sucking-research-app https://seeki

They've had their enterprise signing certificate revoked. https://seekingalpha.com/news/3427520-apple-banning-facebooks-info-sucking-research-app https://seekingalpha.com/news/3427520-apple-banning-facebook... > Apple says. "Any developer using their enterprise certificates to distribute apps to consumers will have their certificates revoked, which is what we did in this case to protect our users and their data.”