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  "title" : "RCSService.GroupChatSubjectInvalidatedEvent"
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# RCSService.GroupChatSubjectInvalidatedEvent

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

```
struct GroupChatSubjectInvalidatedEvent
```

## Overview

Your app should call [`changeGroupChatSubject(_:)`](/documentation/TelephonyMessagingKit/RCSService/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

[`let cellularServiceID: CellularServiceID`](/documentation/TelephonyMessagingKit/RCSService/GroupChatSubjectInvalidatedEvent/cellularServiceID)

Cellular service identifier associated with this event.

[`let groupHandle: RCSHandle.Group`](/documentation/TelephonyMessagingKit/RCSService/GroupChatSubjectInvalidatedEvent/groupHandle)

The group handle whose subject was invalidated.

## Relationships

### Conforms To

[`Sendable`](/documentation/Swift/Sendable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

---

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