diff --git a/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/service/BankingService.kt b/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/service/BankingService.kt
index 65060be..c37a3cf 100644
--- a/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/service/BankingService.kt
+++ b/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/service/BankingService.kt
@@ -38,7 +38,7 @@ class BankingService(
 ) {
 
     private val client = FinTs4kBankingClient(FinTsClientConfiguration(FinTsClientOptions(true)), SimpleBankingClientCallback { tanChallenge, callback ->
-        uiState.tanChallengeReceived.value = TanChallengeReceived(tanChallenge, callback)
+        uiState.receivedTanChallenge(tanChallenge, callback)
     })
 
     private val modelService = BankingModelService()
diff --git a/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/state/UiState.kt b/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/state/UiState.kt
index ec1e93d..848bb9d 100644
--- a/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/state/UiState.kt
+++ b/composeApp/src/commonMain/kotlin/net/codinux/banking/ui/state/UiState.kt
@@ -5,6 +5,8 @@ import androidx.compose.material.DrawerValue
 import androidx.lifecycle.ViewModel
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
+import net.codinux.banking.client.model.tan.EnterTanResult
+import net.codinux.banking.client.model.tan.TanChallenge
 import net.codinux.banking.dataaccess.entities.UserEntity
 import net.codinux.banking.ui.model.*
 import net.codinux.banking.ui.model.error.ApplicationError
@@ -50,6 +52,10 @@ class UiState : ViewModel() {
 
     val tanChallengeReceived = MutableStateFlow<TanChallengeReceived?>(null)
 
+    fun receivedTanChallenge(tanChallenge: TanChallenge, callback: (EnterTanResult) -> Unit) {
+        tanChallengeReceived.value = TanChallengeReceived(tanChallenge, callback)
+    }
+
     val bankingClientErrorOccurred = MutableStateFlow<BankingClientError?>(null)
 
     val applicationErrorOccurred = MutableStateFlow<ApplicationError?>(null)