Error with $config->dbReader: "1836 Running in read-only mode"

[Laikmosh]

Hello, im trying to configure a read replica as documented in https://processwire.com/blog/posts/pw-3.0.175/

I have already configured my aws aurora database to have read replicas

Im using elasticbeanstalk so i configured the writer and reader endpoints as env vars:

and finally added this configuration to my config.php

/**
 * Installer: Database Configuration
 * 
 */
$config->dbHost = $_SERVER['host'];
$config->dbName = $_SERVER['db'];
$config->dbUser = $_SERVER['user'];
$config->dbPass = $_SERVER['pass'];
$config->dbPort = 3306;
$config->dbEngine = 'InnoDB';

if ($_SERVER['hostReader']) {
    $config->dbReader = [
        'host' => $_SERVER['hostReader'],
    ];
};

but now im getting this error anytime i try to load the site:

Error: Exception: SQLSTATE[HY000]: General error: 1836 Running in read-only mode (in wire/core/WireDatabasePDO.php line 889) 

Any ideas what i could be doing wrong?

[Laikmosh]

Im back to be in need of this horizontal scaling, still no clue on what im missing, anyone here has ever tried using read replicas with processwire?