Dear Ziqiao, Thank you for your response regarding the HealthKit authorization issue. I followed your suggestion and completely removed the app from the device, then reinstalled and ran it again. Unfortunately, the authorization issue persists even after the app reinstallation. The HealthKit authorization request is still being denied, and the user is not being presented with the authorization dialog. Since removing and reinstalling the app should reset the authorization status as you mentioned, but the issue continues to occur, this suggests there might be a deeper problem that goes beyond the cached authorization state. Could you please provide additional guidance on: Are there any other system-level caches or settings that might need to be cleared beyond app reinstallation? Could this be related to device-specific settings or iOS version compatibility? Are there any specific debugging steps or logs we should examine to identify the root cause? Should we test this on multiple devices to determine if it's device-specific? I would also be happy to provide additional technical details about our implementation, including: The specific HealthKit sample types we're requesting Our authorization request implementation iOS version and device model being tested Any relevant console logs or error messages Please let me know what additional information would be helpful for troubleshooting this issue. Best regards