SC 9.9.020 Facebook Autentication

Good morning,
when I run the authentication to page Facebook, I receive this message:
“Insecure access blocked
You can’t get an access token or access this app from an insecure page. Try reloading the page as https://”.
The request come out from the domain with Let’s Encrypt enabled.
I think the problem is in the call without the protocol https coded in the code php di Scriptcase.

Somebody can help me?