checkout page private_access_tokens 401

[Merrillk]

I am currently experimenting with the Shopify CLI app to test the boilerplate code for the Checkout UI extensions. However, when I go to the cart, I encounter a console error that says "myshopify.com/private_access_tokens? 401 Unauthorized." As a result, I am unable to see any of the custom code on the checkout page. It's worth mentioning that I'm not using a Shopify Plus store. Could the issue be related to not using Shopify Plus, or is there a problem with the code that's causing the extension to not run properly?

[Liam]

Hi Merrillk,

Checkout UI extensions for the information, shipping and payment step are available only to stores on a Shopify Plus plan, so this may be why you're seeing this issue. Also, are you using a store with the Checkout and Customer Accounts Extensibility developer preview enabled? If you create a UI extension for the Thank You page, is that appearing?

[Merrillk]

Is there anything else I should try? I am still getting a 401 error when calling the myshopify.com/private_access_tokens URL. I am using the developer preview.