You must use the "set" method to update an entry. (Again)

You need to use QueryBuilder.

PHP Code:

$data = [
    'username'         => $username,
    'first_name'       => $first_name,
    'last_name'        => $last_name,
    'email_address'    => $email_address,
    'password'         => $hash,            
    'activation_token' => $token
];
    
$insert = $this->builder->insert($data);

// or

$db      = db_connect();
$builder = $db->table('users');

$data = [
    'username'         => $username,
    'first_name'       => $first_name,
    'last_name'        => $last_name,
    'email_address'    => $email_address,
    'password'         => $hash,            
    'activation_token' => $token
];
    
$insert = $builder->insert($data); 


Take your pick both should work for you.

Set is only used on update.

What did you Try? What did you Get? What did you Expect?

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