Is it possible to modify AWS Cognito user attributes in the Lambda triggers

Question

Having a look at the AWS documentation,

https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-identity-pools-working-with-aws-lambda-triggers.html#cogni

Answer 1

There isn't a way to mutate/augment attributes during sign up, but during sign in, you can mutate/augment them with the pre-token generation trigger.