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[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [PhoneMultiFactorSignInInfoOptions](./auth-types.phonemultifactorsignininfooptions.md) > [multiFactorUid](./auth-types.phonemultifactorsignininfooptions.multifactoruid.md)
## PhoneMultiFactorSignInInfoOptions.multiFactorUid property
The uid of the second factor.
One of `multiFactorHint` or `multiFactorUid` is required.
<b>Signature:</b>
```typescript
multiFactorUid?: string;
```