SOLUTION: You uploaded an APK with an invalid signature - digest

So I have had a couple of clients contact me with recent issues with publishing and updating Google play apps.
So I have had a couple of clients contact me with recent issues with publishing and updating Google play apps. It seems there are issues with some older .keystore certs and apps and google are no longer allowing you to update the app (or sign new ones) using the algorithm SHA-256. From my research, it looks like its caused…

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You uploaded an APK with an invalid signature. Error from apksigner: ERROR: MIN SIG SCHEME FOR TARGET SDK NOT MET: Target SDK version 31 requires a minimum of signature scheme v2; the

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FIX APK with an invalid signature

You uploaded an APK with an invalid signature in Google Play Console