A method includes receiving a request to provision an embedded subscriber identity module (eSIM) profile to an eSIM-enabled device. The request includes a proxy eSIM identifier (EID) prefix. The eSIM profile is associated with a service provider of a mobile communication service a user of the device subscribes to. The method also includes determining whether the proxy EID prefix includes an address of a target discovery server the device is configured to connect to, and when the proxy EID prefix includes the address the method includes extracting the address of the target discovery server from the proxy EID prefix. Using the extracted address of the target discovery server, the method also includes registering a discovery event with the target discovery server indicating that the service provider has reserved the eSIM profile to the proxy EID or an actual EID assigned to the device.