Can you try going to https://zapier.com/app/connections and re-connecting the Woocomerce application?

I have the same problem. I tried like 1000 times and I can't find the problem. Can anyone help me?! 

I think this might be one for the support team

@matoayub and @trampay - You should enable “Pretty permalinks” in your Wordpress settings and your site has to be accessible via https.

@ikbelkirasan “Pretty permalinks” is a plugin?

@trampay No, that’s actually a setting in Wordpress.

@ikbelkirasan i tried to put my on link structure and also a WP defult. None of those options worked. Do I have to make someting diferent or maybe I have another problem? 

WooCommerce recently created a troubleshooting page because a lot of folks are running into authentication issues with them right now with the updated integration. https://om4.io/woocommerce-zapier-documentation/troubleshooting/#authentication-errors

You'll want to find the following section in the table and follow the troubleshooting steps below:

I hope that helps, let us know if you have any questions!

This is huge! Thank you Danvers!