Facebook app is still in development mode & don’t have access

When you setup App on Facebook and try to make login with Facebook available in your script, everything seems fine but when someone attempt to login with a Facebook account he/she gets either of these errors from Facebook: App Not Setup: This app is still in development mode, and you don’t have access to it. Switch to a registered test user or ask an app admin for permissions. The developers of this app have not set up this app properly for Facebook Login.

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