Data not available on redirect

I have something like this inside one of my functions which is triggered by the init action:

$wp_session = WP_Session::get_instance();
...
$wp_session['form_response'] = array(
		'yep' => 'hello',
		'status' => 'success',
		'msg' => 'Updated successfully.'
	);

wp_redirect(get_field('vendor_dashboard_page', 'option'));
exit;

The $wp_session data is not accessible after the redirect using the following in a page template:

<?php
$err = array();
$p = array();
$wp_session = WP_Session::get_instance();

if(isset($_POST['shop_update']))
{
	$p = $_POST;

	if(isset($wp_session['form_response']))
	{
		if(isset($wp_session['form_response']['err']))
			$err = $wp_session['form_response']['err'];

		if(isset($wp_session['form_response']['msg']))
			$msg = $wp_session['form_response']['msg'];

	}
}

Also.. do I need to unset $wp_session after it’s used? If so, what’s the best way to do that.

Thanks!

https://www.ads-software.com/plugins/wp-session-manager/