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SOLVED! Just open a cmd window, navigate to C:\Program Files (x86)\Java\jdk1.8.0_20\bin and execute keytool:
, the SHA256 fingerprint will be displayed in the cmd window.

Then follow the steps in https://developer.android.com/training/app-links/index.html#web-assoc to create the json file and change teh app manifest, but, in the B4A manifest, just type <intent-filter autoVerify="true"> instead of <intent-filter android:autoVerify="true">

Inside the ide you can see it too. Look at the form with your private keystore.
This form can be resized. Make it bigger and you see the sha256 key