Checkout Button not working
If the checkout button is not working in the cart or the mini-cart, the reason is probably that the authentication-popup block was removed from the header-content.
How does the checkout button work?
Clicking the checkout buttons dispatches an event toggle-authentication, which is processed by the authentication-popup block template.
The Magento_Customer/templates/account/authentication-popup.phtml template triggers a login form before redirecting to the cart if guest checkout is disabled.
The authentication-popup block is declared in Magento_Customer/layout/default.xml
<block class="Magento\Customer\Block\Account\Customer" name="authentication-popup"
as="authentication-popup"
template="Magento_Customer::account/authentication-popup.phtml"/>
The authentication-popup template is rendered by the parent template Magento_Theme/templates/html/header.phtml.
How do I find out if I'm missing the authentication-popup?
To check if the authentication-popup block is missing, compare the Magento_Theme/templates/html/header.phtml template in your theme to the original at
The template in your theme is probably missing the line