mutable

Specifies whether the value of the attribute can be changed. Any user pool attribute whose value you map from an IdP attribute must be mutable, with a parameter value of true . Amazon Cognito updates mapped attributes when users sign in to your application through an IdP. If an attribute is immutable, Amazon Cognito throws an error when it attempts to update the attribute. For more information, see Specifying Identity Provider Attribute Mappings for Your User Pool .