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I can’t set a default value on hook_form_alter()

I have form alter for the user_register_form which is called. In this hook, I try to set a default value for a textfield but it doesn’t work. I’ve tried all the syntax possible #default_value, #value, value, default_value, event in the attributes array.

This is my code.

function pre_registration_form_user_register_form_alter(&$form, DrupalCoreFormFormStateInterface $form_state, $form_id) {   $form['field_code_postal']['#cache']['max-age'] = 0;   $form['field_code_postal']['#default_value'] = 'COUCOU';   $form['field_code_postal']['#value'] = 'COUCOU';   $form['field_code_postal']['value'] = 'COUCOU';   $form['field_code_postal']['value']['#value'] = 'COUCOU';   $form['field_code_postal']['value']['#default_value'] = 'COUCOU';   $form['field_code_postal']['value']['value'] = 'COUCOU';   $form['field_code_postal']['value']['default_value'] = 'COUCOU';   $form['field_code_postal']['default_value'] = 'COUCOU';    $form['field_code_postal']['#attributes']['value'] = 'COUCOU1';   $form['field_code_postal']['#attributes']['#value'] = 'COUCOU2';   $form['field_code_postal']['#attributes']['default_value'] = 'COUCOU3';   $form['field_code_postal']['#attributes']['#default_value'] = 'COUCOU4'; }

How can I set a default value?

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I can’t set a default value on hook_form_alter()

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