It's basically a server issue. You've set up your server base url to be localhost:44340, which seems to be the url when you're on your computer.
But since you host it on firebase, your C# server is not accessible from that url (local one, not accessible from the web). You need to specifiy the public url for your backend server.
You can do that with the environment files, you can for exemple specify a different environment variable for the production and build your project with ng build --prod
before shipping it to firebase
See https://angular.io/guide/build for details
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