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Issue abstract: Unable to sign-in with new account and key
Detailed description:
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To clarify. Did you purchase a Norton 360 Android subscription through the Google Play Store? If so, you mention trying to use a different account? Can you clarify that? Any subscription through Google Play Store is linked to the Google account you used to make the purchase.
These subscriptions are managed by Google, not Norton. Check this Google Help page for links for subscription issues. There are links near the bottom of the page for troubleshooting and help. Make in-app purchases in Android apps - Google Play Help