improve error message

packages/core-api/src/lib/loginPopup.test.ts

@@ -208,7 +208,7 @@ describe('showLoginPopup', () => {
       popupMock.closed = true;
     }, 150);
     await expect(payloadPromise).rejects.toThrow(
-      'Login failed, incorrect app origin',
+      'Login failed, Incorrect app origin, expected http://differenthost',
     );
 
     expect(openSpy).toBeCalledTimes(1);

packages/core-api/src/lib/loginPopup.ts

@@ -121,7 +121,7 @@ export function showLoginPopup(options: LoginPopupOptions): Promise<any> {
       if (popup.closed) {
         const errMessage = `Login failed, ${
           targetOrigin !== window.location.origin
-            ? 'incorrect app origin'
+            ? `Incorrect app origin, expected ${targetOrigin}`
             : 'popup was closed'
         }`;
         const error = new Error(errMessage);