I followed the guide at the following link Examples - Unity SDK - Documentation - Meta for Developers.
I downloaded the openssl installer as one of the step.
In the Inspector FacebookSettings, i have maintained the app name ,facebook app id and client token.
The Android build facebook settings, I have created the debug.keystore and provided the path.
It show the debug android key hash is populated.
When I tested the apk on my mobile device, it says that no android app key hashes configured.
I went into the https://developers.facebook.com/apps/XXXX for my app and I dont see any setting -basic/advanced or even Log into Facebook that shows how to configure this key hashes.
I also noted that in the debug android key hash(?), it says copy this key to facebook settings in order to test a facebook android app.
Appreciate it if someone can let me know if there is such a setting in Facebook setting to configure this ?