Flutter AWS Auth: How to get custom user attribute?

How do I get in Flutter, the cognito custom user attribute for user?

await Amplify.Auth.fetchUserAttributes();

returns only user attributes but not the custom defined ones.

(I have added the attribute to the schema and I am sure it's there, in the AWS UI it's there.)

The issue was that these custom attributes, after they are created, they are not by default readable or writable.

For further explanations, check https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-attributes.html#user-pool-settings-attribute-permissions-and-scopes Go to cognito - app clients - details - and very bottom to change permissions