"We have a duty to act - and yet we are gridlocked in colossal global dysfunction."
The prime minister's travel agenda was swiftly re-worked in the wake of the Queen's death.
Ardern will travel to New York on September 17.
The Prime Minister will also co-host a Christchurch Call to Action Leaders' Summit with President of France Emmanuel Macron.
"It's a real missed opportunity."
She made her plea virtually.
But it isn't the only country criticising Australia.
A video of the incident was posted to Twitter.