Re-add exception throw when B2C is used with device code flow

Author: Avery-Dunn

src/main/java/com/microsoft/aad/msal4j/PublicClientApplication.java

@@ -55,6 +55,12 @@ public CompletableFuture<IAuthenticationResult> acquireToken(IntegratedWindowsAu
     @Override
     public CompletableFuture<IAuthenticationResult> acquireToken(DeviceCodeFlowParameters parameters) {
 
+        if (!(AuthorityType.AAD.equals(authenticationAuthority.authorityType()) ||
+                AuthorityType.ADFS.equals(authenticationAuthority.authorityType()))) {
+            throw new IllegalArgumentException(
+                    "Invalid authority type. Device Flow is only supported by AAD and ADFS authority");
+        }
+
         validateNotNull("parameters", parameters);
 
         AtomicReference<CompletableFuture<IAuthenticationResult>> futureReference =

src/test/java/com/microsoft/aad/msal4j/DeviceCodeFlowTest.java

@@ -149,6 +149,21 @@ public void deviceCodeFlowTest() throws Exception {
         PowerMock.verify();
     }
 
+    @Test(expectedExceptions = IllegalArgumentException.class,
+            expectedExceptionsMessageRegExp = "Invalid authority type. Device Flow is only supported by AAD and ADFS authority")
+    public void executeAcquireDeviceCode_B2CAuthorityUsed_IllegalArgumentExceptionThrown()
+            throws Exception {
+
+        app = PublicClientApplication.builder("client_id")
+                .b2cAuthority(TestConfiguration.B2C_AUTHORITY)
+                .validateAuthority(false).build();
+
+        app.acquireToken
+                (DeviceCodeFlowParameters
+                        .builder(Collections.singleton(AAD_RESOURCE_ID), (DeviceCode deviceCode) -> {})
+                        .build());
+    }
+
     @Test
     public void executeAcquireDeviceCode_AuthenticaionPendingErrorReturned_AuthenticationExceptionThrown()
             throws Exception {