[Home](./index.md) > [@firebase/auth](./auth.md) > [AuthError](./auth.autherror.md) ## AuthError interface Interface for an Auth error. Signature: ```typescript export interface AuthError extends FirebaseError ``` Extends: FirebaseError ## Properties | Property | Type | Description | | --- | --- | --- | | [appName](./auth.autherror.appname.md) | string | The name of the Firebase App which triggered this error. | | [email?](./auth.autherror.email.md) | string | (Optional) The email of the user's account, used for sign-in/linking. | | [phoneNumber?](./auth.autherror.phonenumber.md) | string | (Optional) The phone number of the user's account, used for sign-in/linking. | | [tenantid?](./auth.autherror.tenantid.md) | string | (Optional) The tenant ID being used for sign-in/linking. |