What is the event that will fire after cancelling the order in Magento 2

Question

I am trying to do something customization from my custom module after an order has been cancelled (Frontend as well Backend). For this I have gone through cancelled Observer on the sales/etc/events.xml and sales/etc/adminhtml/events.xml, But I can't find where it is.

Could you please help me where it is(Observer)? to do something after cancelled the order Frontend(Customer) and Backend(Vendor/Seller).

Which observer will use from frontend and backend?

Answer 1

The event you're looking for is order_cancel_after and it's dispatched in the cancel method of \Magento\Sales\Model\Order :

public function cancel()
{
    if ($this->canCancel()) {
        $this->getPayment()->cancel();
        $this->registerCancellation();

        $this->_eventManager->dispatch('order_cancel_after', ['order' => $this]);
    }

    return $this;
}

Answer 2

six types of Cancel events for Orders in Magento 2

1. order_cancel_after

This event is used after order canceled. If you want to do something after an order is canceled you can use this event. Check file, vendor/magento/module-sales/Model/Order.php at cancel() function.

2. sales_order_invoice_cancel

Allows you to cancel the order invoice when you canceled the order. Check event called at, file, vendor/magento/module-sales/Model/Order/Invoice.php at cancel() function.

3. sales_order_payment_cancel_invoice

Allows you to cancel the order invoice when you canceled the order. Check event called at, file, vendor/magento/module-sales/Model/Order/Invoice.php at cancel() function.

4. sales_order_payment_cancel_creditmemo

Event defined under vendor/magento/module-sales/Model/Order/Payment.php using cancelCreditmemo() function but this function is not called at any file. Might be used in future developments. This event contains payment and specified creditmemo object.

5. sales_order_payment_cancel_invoice

Cancel specified invoice from order and update self-total from order invoice. Event defined under vendor/magento/module-sales/Model/Order/Payment.php

6. sales_order_creditmemo_cancel

When you want to refund from a specific order or specific item from order, Your best suitable event is, sales_order_creditmemo_cancel

More detail you can review rakesh sir blog https://www.rakeshjesadiya.com/different-types-of-cancel-events-for-orders-in-magento-2/