In the newest Rollbar Apple SDK, core configuration fields—such as the person object, the accessToken, and other environment settings—are defined as read-only properties. As a result, any direct assignment like config.person = … or config.destination.accessToken = … will fail at compile time. The official documentation (https://docs.rollbar.com/docs/sdk-module-rollbaraul) references these as configurable, but they can only be set once at initialization via the SDK’s provided factory and setter methods (for example, RollbarConfig.mutableConfig(withAccessToken:) and config.setPersonId(_:username:email:)). After initialization, you must use the corresponding setPersonId or legacy setter APIs—rather than trying to overwrite the read-only properties—to update the user context or token.