Problem: iOS device synchronization fails, and the Unwired Server log reports a subscribeFailure message.
Explanation: A package type mismatch can cause synchronization errors. The subscribeFailure message imports a log record to the client with the reason for the failure (such as package not found, or invalid credentials). You can use the database class method getLogRecords to get the record that was imported.
Solution: Use message information to solve the problem. For example, you may need to provide valid credentials, correct settings (for example, only MBS is supported for iOS), or reinstall the package on Unwired Server.