How do I revoke a broken Facebook setup?

I had an old FB login setup, but FB changed things awhile back and it broke. I didn't know for a long time that this had happened. I tried setting up a new FB Login in my Facebook Developer account according to your instructions, but since one had been set up before, the App ID and App Secret are there for the old login. How do I revoke the old one so that the new one will take instead? The original social login has already been deleted from my Facebook Developer account.

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