Oauth Facebook Issue with redirect URI
You can set usePathInfo = true in your Craft general settings to force Craft to use PATH_INFO to generate URLs.

https://craftcms.com/docs/config-settings#usePathInfo

Dukt OAuth should now show you a redirect URI without a query string (Facebook doesn’t like slashes in the query string and automatically encodes them) and you should be able to make the URIs match exactly.