ACUL signup not attaching phone number

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Im currently trying to create a custom signup flow with ACUL. Im using the SignupOptions interface to pass data to auth0, but the field phone is not working. I have also tried to add custom fields as phoneNumber and phone_number but nothing seems to set the users phone number on the auth0 user object.

Im using this interface provided by the SDK:

export interface SignupOptions {
email?: string;
username?: string;
phone?: string;
captcha?: string;
[key: string]: string | number | boolean | undefined;
}

This is the payload printed before its sendt:

Object { email: "``amund.fremming+test10@gmail.com``", username: "", phone: "41387142", captcha: "", given_name: "Amund", family_name: "Fremming" }

And this is the auth0 user object after user creation:

{
“user_id”: “auth0|6a0fff6efd418ca80717c92e”,
“created_at”: “2026-05-22T07:02:06.203Z”,
“email”: “``amund.fremming+test10@gmail.com``”,
“email_verified”: false,
“identities”: [
{
“connection”: “Username-Password-Authentication”,
“provider”: “auth0”,
“user_id”: “6a0fff6efd418ca80717c92e”,
“isSocial”: false
}
],
“name”: “``amund.fremming+test10@gmail.com``”,
“nickname”: “amund.fremming+test10”,
“picture”: “``https://s.gravatar.com/avatar/6ba82f81c0780dddecea0636dbead9d3?s=480&r=pg&d=https%3A%2F%2Fcdn.auth0.com%2Favatars%2Fam.png”``,
“updated_at”: “2026-05-22T07:02:06.203Z”,
“user_metadata”: {},
“app_metadata”: {
“given_name”: “Amund”,
“family_name”: “Fremming”
},
“last_ip”: “109.74.183.126”,
“last_login”: “2026-05-22T07:02:06.196Z”,
“logins_count”: 1,
“guardian_authenticators”:,
“blocked_for”:,
“passkeys”:
}