New York CNN Business  — 

Apple has restored Facebook’s access to a private section of the App Store after the social network released an app that violated Apple’s policies.

The vast majority of apps in the iTunes App Store must be downloaded from the public section of the store. That’s what just about everyone sees when they hit the App Store button on their iPhones. But Apple allows software developers to test and privately release apps that are in development. Those apps are available in a hidden part of the App Store and can only be accessed by developers with a special “enterprise certification” granted to them by Apple.

Apple (AAPL) pulled Facebook’s enterprise certification Wednesday after discovering Facebook released a research app to the public using that hidden part of the store. That violated Apple (AAPL)’s App Store rules: The testing ground is designed to be used for companies to work out the bugs in their apps before they are made public. Unlike Google’s (GOOGL) Android operating system, Apple (AAPL) does not allow iOS developers to bypass the public App Store for developers to release apps directly to consumers.

By taking away Facebook (FB)’s certification, Apple prevented Facebook (FB) from testing its own apps on the iPhone. The time-out didn’t last long. Facebook (FB) confirmed Apple restored its access Thursday night.

“We are in the process of getting our internal apps up and running,” a Facebook spokesman told CNN Business. “To be clear, this didn’t have an impact on our consumer-facing services.”

The Facebook Research App

Apple has banned a controversial market research app that Facebook used to collect information on how people use their smartphones, claiming the app violated the social network’s agreement with Apple.

The spokesperson also told CNN Business the app was not “spying” on people.

The news comes as Facebook (FB) continues to deal with the fallout from other privacy scandals and concerns about how it handles user data. Last year, political research firm Cambridge Analytica improperly harvested information on tens of millions of Facebook (FB) users.

In October, Facebook said hackers accessed the phone numbers and email addresses of nearly 30 million users.

Rob Mclean contributed to this report