We are trying to build an application with both razor pages and API endpoints and an Angular app to access the API endpoints. Web Application #1 I've been able to connect to Entra ID from the razor page side of the primary AspNet Core web project, and it redirects to Microsoft to login, then redirects back to the site and works fine. Web Application #2 I've also got an Angular site built from the Asp.Net Core SPA template using azure/msal-* npm packages to login to Entra ID.