Amplify Gen 2, fullname userAttributes not present on sign up

Ok then I try with 'name' in amplify/auth/resource.ts and I've got error "'name' does not exist in type 'StandardAttributes'":

userAttributes: { // require the attribute be provided during sign-up name: { required: true, mutable: true }, }

and if if I try npx amplify sandbox, error "TypeScript validation check failed, check your backend definition"

Also I know you wanted to use an attribute called "fullname", but the backend authentication resource authored using defineAuth does not currently support adding custom attributes. If you wish to add custom attributes you will need to define them using overrides.

// amplify/backend.ts
import { defineBackend } from '@aws-amplify/backend';
import { auth } from './auth/resource.js';
import { data } from './data/resource.js';

const backend = defineBackend({
  auth,
  data
});

// extract L1 CfnUserPool resources
const { cfnUserPool } = backend.auth.resources.cfnResources;
// use CDK's `addPropertyOverride` to modify properties directly
cfnUserPool.addPropertyOverride("Schema", [
  {
    Name: "publicName",
    AttributeDataType: "String",
    Mutable: true,
  },
]);

That weird, I was checking the documentation for Amplify Gen 2, name exists in the type StandardAttribute. Let's try this:

export const auth = defineAuth({
  loginWith: {
    email: true
  },
  userAttributes: {
    // require the attribute be provided during sign-up
    name: {
      required: true
    },
    nickname: {
      required: true
    },
    given_name: {
      required: true
    },
    // do not allow changing of an attribute's value
    birthdate: {
      mutable: false
    }
  }
});

can you share your amplify/auth/resource.ts?

And as you mentionned before 'name' is part of OpenID Connect specification.

I don't want fullName.. I just want 'name', I've only tried with fullName because name alone was causing touble, but my goal here is simply to have name.

Here is my amplify/auth/resource.ts:

import {defineAuth} from '@aws-amplify/backend';

export const auth = defineAuth({
    loginWith: {
        email: true
    },
    userAttributes: {
        // require the attribute be provided during sign-up
        name: {
            required: true,
            mutable: true
        },
    }
});