in app purchase - Android in-app billing error: Authentication is required -


i have app published on google play store in-app purchase upgrade full version. iab library updated v3 in latest app release.

many users complain can't buy upgrade. error is: "authentication required. need sign google account."

screenshot

i noticed error in logs: basicnetwork.performrequest: unexpected response code 403 https://android.clients.google.com/fdfe/preparepurchase

this managed product. i've checked sku, keys, everything, couldn't find cause of error. users complaining , i'm losing income... appreciated!


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