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Simple echo not working on Admin Area using hook


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Hello! I'm trying to make a simple hook to echo something, but it's not working on the admin area.

My WHMCS version is 8.2.1

This is my code:


use WHMCS\Session;
use WHMCS\Ticket\Watchers;

function testing($vars) {
	echo 'test';


It works on normal client pages like ClientAreaPageProductDetails etc, but not on admin area ones.

Am i missing something?

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