Issue appears in many merchant sites and for multiple different customers: If attempting to use Express Checkout via Shopify from an webview (Facebook or Instagram), if the customer does not have 2FA enabled, the final step of the checkout fails and payment is not taken. The user is presented with a blank popup. This has also been raised as a ticket with Shopify, however it is the Paypal checkout that's failing. We've tested multiple merchants via 3 different accounts and it occurs with the majority of sites. This does not occur if same page is loaded in a regular browser. There is no way to circumvent webviews that Instagram/Facebook use, resulting in a broken checkout for many customers. This also happens on my personal account, though we have tested on others (and customers have raised the issue). Enabling 2FA appears to fix the issue, but clearly this is not a solution as end-customers are presented with a blank popup with no explination.
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