Systems, methods, and apparatuses are disclosed for file synchronizing service status monitoring and error handling. A client device includes a local file system access manager that includes a status interface. The status interface is configured to receive a status message from a client-side sync manager of the client device. The client-side sync manager that communicates with a server-side sync manager at a server to synchronize data objects between file systems of the client device and server. The status message corresponds to a state of the client-side sync manager during a multi-stage start-up process for the client-side sync manager. A status caller in an application of the client device can retrieve the status message from the status interface. The status message can also be provided to a user interface for display to a user of the client device, and/or to a telemetry server for use in improving the file synchronizing service.