My APK is signed with a valid key, but I still get a 422 error. What could be the problem?

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Grade: Education Subject: Support
My APK is signed with a valid key, but I still get a 422 error. What could be the problem?
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While a valid key is essential, it's not the only factor. The signing configuration might be incorrect (e.g., wrong key alias, incorrect v1/v2 signatures). Ensure your APK is signed with both v1 and v2 signatures, as Google Play requires it. Also, verify that the key's expiration date hasn't passed.