---
title: RCSService.GroupChatSubjectInvalidatedEvent
framework: TelephonyMessagingKit
role: symbol
role_heading: Structure
platforms: [iOS 26.5+]
path: telephonymessagingkit/rcsservice/groupchatsubjectinvalidatedevent
---

# RCSService.GroupChatSubjectInvalidatedEvent

Event triggered when a group’s encryption state changes, which causes the group subject to be cleared on the server.

## Declaration

```swift
struct GroupChatSubjectInvalidatedEvent
```

## Overview

Overview Your app should call changeGroupChatSubject(_:) to restore the group’s subject. Failing to do so will leave the group without a subject. You can ignore this event if the group was unnamed.

## Topics

### Instance Properties

- [cellularServiceID](telephonymessagingkit/rcsservice/groupchatsubjectinvalidatedevent/cellularserviceid.md)
- [groupHandle](telephonymessagingkit/rcsservice/groupchatsubjectinvalidatedevent/grouphandle.md)

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)