Tenant with custom domain enabled but can't use custom signup prompt

I’ve configured and activated a custom domain to my dev tenant.

Now I’m trying to use de ManagementAPI to create custom signup partials to the New Universal Login, but the response from API is the message below:

GET (or PUT) https://{{myCustomDomain}}/api/v2/prompts/signup/partials
    "statusCode": 403,
    "error": "Forbidden",
    "message": "Your account does not have custom prompts enabled",
    "errorCode": "operation_not_supported"

I checked the doc Sign-up Prompt Customizations and I think that all required actions are ok:

  1. Make sure your tenant has a Custom Domain configured. OK (status ready).
  2. Confirm you are using New Universal Login for all signup and login prompts and ensure that Customize Login Page is disabled for Login Prompts. Using NUL and Customization is Disabled.
  3. Check that you have a Custom Page Template configured. I have a doubt about this, it’s just update the HTML using the code below? (already executed)
PUT https://{{myCustomDomain}}/api/v2/branding/templates/universal-login

<!DOCTYPE html>
<html lang="{{locale}}">
    {%- auth0:head -%}
      body {
        background-image: url("https://images.unsplash.com/photo-1592450865877-e3a318ec3522?ixlib=rb-1.2.1&auto=format&fit=crop&w=2255&q=80");
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
      .prompt-wrapper {
        position: relative;
        display: flex;
        align-items: center;
        width: 480px;
        height: 100%;
        justify-content: center;
        background-color: rgb(60,60,60);
    <title>{{ prompt.screen.texts.pageTitle }}</title>

  <body class="_widget-auto-layout">
    {% if prompt.name == "login" or prompt.name == "signup" %} 
        <div class="prompt-wrapper">
        {%- auth0:widget -%}
    {% else %}
        {%- auth0:widget -%}
    {% endif %}

I’ll appreciate any help.

Hey, you need to get your AM to request access to this feature as its EA and requires opt-in, otherwise youve done the other steps I did as per the guide to get it started.

Recently requested it on a 2nd tenant and it took ~10days to be flagged active(didnt get comms was just a case of check on mon or fris if youre bundled it in on the chg)

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