As a default, in your Shopify settings, your Customer Accounts are Disabled.
When a customer tries to join your loyalty program through the widget, they are asked to create a Shopify account. Due to the default settings in Shopify, you will need to update this to Accounts are Optional. Customers will now be able to sign-up through your loyalty widget and still checkout as a guest.
Optimize all Shopify settings to make sure your loyalty program works perfectly.
> See Shopify settings best practices
This video demonstrates the journey of a customer signing up through your loyalty widget when all Shopify settings are set up correctly.