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# knownHandles(in:)

Checks which handles in a given set are known to the system.

```
final func knownHandles(in handles: Set<CommunicationHandle>) async -> Set<CommunicationHandle>
```

## Parameters

`handles`

A set of communication handles, such as email addresses,
phone numbers, user names, or any other set of personal identifiers.

## Return Value

A subset of the given handles known to the system.

## Discussion> Note: This method requires that the calling app have a non-nil, nonempty bundle identifier.

---

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