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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[@nativescript/biometrics] Issue with verifyBiometric on iOS 18.3.1: Unable to Retrieve Stored Secret When Using pinFallback","articleBody":"\n#### Description\nWhile using iOS 18.3.1, I encountered an issue with the `verifyBiometric` function where enabling `pinFallback` prevents retrieval of the stored secret.\n\n#### Code Example\n```javascript\nthis._BiometricAuth.verifyBiometric({\n    title: 'Authenticate',\n    message: 'Verify your identity to access your account.',\n    keyName: 'MyKeyName',\n    pinFallback: true, // Allow fallback to device passcode\n    ios: {\n      fetchSecret: true, // Retrieve stored secret upon successful authentication\n      customFallback: false, // Do not use custom fallback logic\n    },\n});\n```\n\n#### Expected Behavior\n- If Face ID fails, the system should prompt the user to enter their device passcode.\n- After successful authentication (via Face ID or passcode), the stored secret should be retrievable.\n\n#### Actual Behavior\n- When `pinFallback: true`, the stored secret is not accessible.\n- This behavior seems to be affected by `customFallback: false`, even though I intend for it to behave similarly to Face ID authentication.\n- If `pinFallback: false`, Face ID failures result in an error (`SecItemCopyMatching`), and the passcode prompt does not appear.\n\n#### Question\nIs there a way to retrieve the stored secret when `pinFallback: true` and `customFallback: false`? Am I missing a configuration that allows proper fallback behavior while still being able to fetch the stored secret?\n\n#### Environment\n- **iOS Version:** 18.3.1\n- **Biometric Authentication Library:** `@nativescript/biometrics: \"1.3.1\"`\n- **Device Model:** iPhone 15 Pro, iPhone 16\n\nAny guidance or workarounds would be greatly appreciated!","author":{"url":"https://github.com/kyrstencarlson","@type":"Person","name":"kyrstencarlson"},"datePublished":"2025-02-28T18:16:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/616/plugins/issues/616"}