Removed the following methods for updating custom authentication extension objects: PUT /identity/authenticationEventListeners/{listenerId}/microsoft.graph.onAttributeCollectionStartListener/handler/microsoft.graph.onAttributeCollectionStartCustomExtensionHandler/customExtension/$ref , PUT /identity/authenticationEventListeners/{listenerId}/microsoft.graph.onAttributeCollectionSubmitListener/handler/microsoft.graph.onAttributeCollectionSubmitCustomExtensionHandler/customExtension/$ref , PUT /identity/authenticationEventListeners/{listenerId}/microsoft.graph.onEmailOtpSendListener/handler/microsoft.graph.onOtpSendCustomExtensionHandler/customExtension/$ref. Use the PATCH /identity/customAuthenticationExtensions/{customAuthenticationExtensionId} operation instead.