| As mentioned in the [NameID](#nameid) section, if the NameID changes for any user, the user can be locked out. This is a common problem when an email address is used as the identifier. | Follow the steps outlined in the ["SAML authentication failed: User has already been taken"](#message-saml-authentication-failed-user-has-already-been-taken) section. If many users are affected, we recommend that you use the appropriate API. |
| As mentioned in the [NameID](#nameid) section, if the NameID changes for any user, the user can be locked out. This is a common problem when an email address is used as the identifier. | Follow the steps outlined in the ["SAML authentication failed: User has already been taken"](#message-saml-authentication-failed-user-has-already-been-taken) section. |