Access Token / FB app

I can not seem to get the access token. I keep getting this error on FB.
“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.”

I do not have the app listed and I did not receive an invite.

It was working before the last update and I tried re-installing and clearing cache.

Please advise.

Cheers’
bde

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