Shopify's Legacy Customer Accounts, previously known as Classic Customer Accounts is a traditional login method requiring customers to log in using an email and password, with accounts created through invitations or direct signups.
Legacy customer accounts or classic customer accounts offer limited customization and functionality along with rigid interaction frameworks, and minimal self-service options, often restricting businesses from tailoring the customer experience to their specific needs.
Refer to this page to configure Single Sign-On on your Shopify legacy customer accounts with your desired identity provider.
If you need further assistance with configuration, please feel free to contact our team.