diff --git a/app/src/main/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensions.kt b/app/src/main/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensions.kt
index 3a923de94..3ed674c34 100644
--- a/app/src/main/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensions.kt
+++ b/app/src/main/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensions.kt
@@ -32,14 +32,13 @@ val GetTokenResponseJson.TwoFactorRequired?.preferredAuthMethod: TwoFactorAuthMe
 /**
  * If it exists, return the value of the Duo auth url.
  */
-val GetTokenResponseJson.TwoFactorRequired?.twoFactorDuoAuthUrl: String
+val GetTokenResponseJson.TwoFactorRequired?.twoFactorDuoAuthUrl: String?
     get() = this
         ?.authMethodsData
         ?.duo
         ?.get("AuthUrl")
         ?.jsonPrimitive
         ?.contentOrNull
-        .orEmpty()
 
 /**
  * If it exists, return the value to display for the email used with two-factor authentication.
diff --git a/app/src/main/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModel.kt b/app/src/main/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModel.kt
index cf4441883..6ffbcfd9d 100644
--- a/app/src/main/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModel.kt
+++ b/app/src/main/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModel.kt
@@ -160,10 +160,19 @@ class TwoFactorLoginViewModel @Inject constructor(
      */
     private fun handleContinueButtonClick() {
         if (state.authMethod.isDuo) {
+            val authUrl = authRepository.twoFactorResponse.twoFactorDuoAuthUrl
+            // The url should not be empty unless the environment is somehow not supported.
             sendEvent(
-                event = TwoFactorLoginEvent.NavigateToDuo(
-                    uri = Uri.parse(authRepository.twoFactorResponse.twoFactorDuoAuthUrl),
-                ),
+                event = authUrl
+                    ?.let {
+                        TwoFactorLoginEvent.NavigateToDuo(
+                            uri = Uri.parse(it),
+                        )
+                    }
+                    ?: TwoFactorLoginEvent.ShowToast(
+                        // TODO BIT-1927 Update to use string resource
+                        message = "Duo not yet supported".asText(),
+                    ),
             )
         } else {
             initiateLogin()
diff --git a/app/src/test/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensionTest.kt b/app/src/test/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensionTest.kt
index 092bfccc1..a225ec565 100644
--- a/app/src/test/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensionTest.kt
+++ b/app/src/test/java/com/x8bit/bitwarden/data/auth/datasource/network/util/TwoFactorRequiredExtensionTest.kt
@@ -6,6 +6,7 @@ import kotlinx.serialization.json.JsonNull
 import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.JsonPrimitive
 import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
 import org.junit.jupiter.api.Test
 
 class TwoFactorRequiredExtensionTest {
@@ -62,7 +63,7 @@ class TwoFactorRequiredExtensionTest {
     }
 
     @Test
-    fun `twoFactorDuoAuthUrl returns empty string when no DUO AuthUrl is present`() {
+    fun `twoFactorDuoAuthUrl returns null when no DUO AuthUrl is present`() {
         val subject = GetTokenResponseJson.TwoFactorRequired(
             authMethodsData = mapOf(
                 TwoFactorAuthMethod.AUTHENTICATOR_APP to JsonObject(mapOf("AuthUrl" to JsonNull)),
@@ -70,7 +71,7 @@ class TwoFactorRequiredExtensionTest {
             captchaToken = null,
             ssoToken = null,
         )
-        assertEquals("", subject.twoFactorDuoAuthUrl)
+        assertNull(subject.twoFactorDuoAuthUrl)
     }
 
     @Test
diff --git a/app/src/test/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModelTest.kt b/app/src/test/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModelTest.kt
index cdebb126e..41ecfb897 100644
--- a/app/src/test/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModelTest.kt
+++ b/app/src/test/java/com/x8bit/bitwarden/ui/auth/feature/twofactorlogin/TwoFactorLoginViewModelTest.kt
@@ -249,8 +249,9 @@ class TwoFactorLoginViewModelTest : BaseViewModelTest() {
         }
     }
 
+    @Suppress("MaxLineLength")
     @Test
-    fun `ContinueButtonClick login should emit NavigateToDuo when auth method is Duo`() = runTest {
+    fun `ContinueButtonClick login should emit NavigateToDuo when auth method is Duo and authUrl is non-null`() = runTest {
         val authMethodsData = mapOf(
             TwoFactorAuthMethod.DUO to JsonObject(
                 mapOf("AuthUrl" to JsonPrimitive("bitwarden.com")),
@@ -281,6 +282,35 @@ class TwoFactorLoginViewModelTest : BaseViewModelTest() {
         }
     }
 
+    @Suppress("MaxLineLength")
+    @Test
+    fun `ContinueButtonClick login should emit ShowToast when auth method is Duo and authUrl is null`() = runTest {
+        val authMethodsData = mapOf(
+            TwoFactorAuthMethod.DUO to JsonObject(
+                mapOf("Nothing" to JsonPrimitive("Nothing")),
+            ),
+        )
+        val response = GetTokenResponseJson.TwoFactorRequired(
+            authMethodsData = authMethodsData,
+            captchaToken = null,
+            ssoToken = null,
+        )
+        every { authRepository.twoFactorResponse } returns response
+        val mockkUri = mockk<Uri>()
+        val viewModel = createViewModel(
+            state = DEFAULT_STATE.copy(
+                authMethod = TwoFactorAuthMethod.DUO,
+            ),
+        )
+        viewModel.eventFlow.test {
+            viewModel.actionChannel.trySend(TwoFactorLoginAction.ContinueButtonClick)
+            assertEquals(
+                TwoFactorLoginEvent.ShowToast("Duo not yet supported".asText()),
+                awaitItem(),
+            )
+        }
+    }
+
     @Test
     fun `ContinueButtonClick login returns CaptchaRequired should emit NavigateToCaptcha`() =
         runTest {