What will happen if you try to add a new server endpoint in Azure File Sync that is already registered?

When attempting to add a new server endpoint in Azure File Sync that is already registered, the operation will fail until the server is unregistered. This is because Azure File Sync requires each server endpoint to be unique within a particular sync group. Having multiple server endpoints pointing to the same server or path would create conflicts in the synchronization process.

To ensure the integrity of the sync process, Azure File Sync enforces a one-to-one relationship between a server and its endpoints within a sync group. If you try to register an endpoint that already exists, Azure will prevent the operation, emphasizing the need to unregister the existing endpoint first before adding a new one.

Understanding this behavior is crucial for managing Azure File Sync effectively, as it helps prevent potential data synchronization conflicts and maintains the stability of the deployed syncing configurations.