it's kind of a three-fold problem for me. v4.0.6 absolutely broke it for me, the facebook login popup dialogue was not coming up with v4.0.6
when i installed sppb v4.0.5, the facebook window dialogue showed up again. although that was not my entire problem.
i actually had to recreate the facebook app completely, and lastly, after the facebook logging in and connection, it didn't save the credentials for some reason.
i had to pop into phpmyadmin to update the table with the generated access token and igId (instagram ID), its inside the XXXX_extensions table. it may be easiest to download the SQL table to find which "id" it is... search the table for the "app_id" the facebook app id.. you should find something like this.
{"production_mode":1,"gmap_api":"","fontawesome":1,"disable_google_fonts":0,"lazyloadimg":0,"lazyplaceholder":"https:\/\/res.cloudinary.com\/joomshaper\/image\/upload\/v1582107175\/placeholder.svg","disableanimatecss":0,"disablecss":0,"disable_og":0,"fb_app_id":"","disable_tc":0,"joomshaper_email":"[email protected]","joomshaper_license_key":"our_license_key","ig_token":"{\"app_id\":\"our_app_id\",\"app_secret\":\"our_app_secret\",\"accessToken\":\"OUR_ACCESS_TOKEN\",\"igId\":\"OUR_IG_ID\"}"}
we had to update the "OUR_ACCESS_TOKEN" and "OUR_IG_ID" with the provided in the popup.
results may vary.. hope this helps.. i know its a pain. but it's what we have right now.