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There could be several causes of null data intent when using universal links/applinks with react-native-app-auth on Android, including: 1. Improper configuration of the universal links/applinks in the Android Manifest file or Firebase console. 2. Missing intent filters for the specific activity that handles the universal links/applinks. 3. Incorrect handling of incoming intents in the activity code. 4. Issues with SSL certificates or domain validation while setting up the universal links/applinks. 5. Problems with the AppAuth library version or implementation. 6. Compatibility issues with the device or the Android operating system. To troubleshoot the issue, one should review the Android Manifest and the Firebase console configurations, check the intent filters and activity code, and ensure that SSL certificates and domains are correctly validated. Upgrading the AppAuth library or checking for compatibility issues with the device may also help in resolving the error.