nativebreed

Issue resolved. The issue was that my function was returning a string instead of an array.

Below is the final working code for anyone that needs it.

BTW, I also added, in the final version, an option to set notification_id to apply the routing to – I don’t think this is not necessary – but ….

define( 'MYFC_FORM_ID', 1 );
define( 'MYFC_SELECT_FIELD_ID',3 );
define( 'MYFC_DEFAULT_NOTI_EMAIL', 'c@test.com' );

// Optional: set to an integer to restrict email routing to one specific notification. Leave undefined (or set to 0) to apply routing to ALL notifications on the form.
define( 'MYFC_NOTIFICATION_ID', 1 );

function myfc_get_email_routes() {
    return array(
        'Text A' => 'a@test.com',
        'Text B' => 'b@test.com',
    );
}

add_filter( 'wpforms_entry_email_atts', 'myfc_dynamic_email_routing', 10, 5 );

function myfc_dynamic_email_routing( $email, $fields, $entry, $form_data, $notification_id ) {
    if ( (int) $form_data['id'] !== MYFC_FORM_ID ) {
        return $email;
    } 
    if ( defined( 'MYFC_NOTIFICATION_ID' ) && (int) MYFC_NOTIFICATION_ID !== 0 ) {
        if ( (int) $notification_id !== (int) MYFC_NOTIFICATION_ID ) {
            return $email;
        }
    }
    $selected = isset( $fields[ MYFC_SELECT_FIELD_ID ]['value'] )
        ? trim( $fields[ MYFC_SELECT_FIELD_ID ]['value'] )
        : '';
    $routes       = myfc_get_email_routes();
    $routed_email = MYFC_DEFAULT_NOTI_EMAIL;
    if ( isset( $routes[ $selected ] ) ) {
        $routed_email = $routes[ $selected ];
    }
    $email['address'] = array( $routed_email );
    return $email;
}