Uncaught Reference Error: shell is not defined in Power Pages

In Power Pages, shell.getTokenDeferred() is part of the Power Pages runtime and is automatically available only when using authenticated pages that rely on the site authentication system (e.g., local authentication, Azure AD B2C, etc.). If you’re building a custom JavaScript login, registration, or data API interaction, and you get an error like: Uncaught ReferenceError: shell […]