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AUTH_UNION_ID_HAS_BEEN_BOUND

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Error Cause​

unionId is already associated with account, this WeChat unionId has been bound to another account.

Solution​

  1. Directly login with the bound account
  2. Check WeChat Open Platform's unionId configuration
  3. Verify if duplicate binding across different applications
  4. If you need to change binding, unbind existing association first
  5. Contact technical support to handle cross-application account binding issue