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Is your redirect URI really just site.com? Go check the value of the redirect_uri parameter in the login dialog call. You have to specify the URL used there as a Valid OAuth Redirect URI

Sounds like Xenforo is having trouble working out what protocol you're using (as Cloudflare is proxying traffic to your origin over HTTP whilst it's going to end user over HTTPS). The best option in this case is to install the Mod_Cloudflare Apache extension as it will automatically correct...