diff --git a/CHANGELOG.md b/CHANGELOG.md
index e7aed57fdae..c19a400697e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -72,6 +72,7 @@ Here is an overview of all new **experimental** features:
 
 - **General**: Fix CVE-2023-39325 in golang.org/x/net ([#5122](https://github.com/kedacore/keda/issues/5122))
 - **General**: Prevented stuck status due to timeouts during scalers generation ([#5083](https://github.com/kedacore/keda/issues/5083))
+- **General**: TriggerAuthentication - validation `identityId` removed from the operator ([#5109](https://github.com/kedacore/keda/issues/5109))
 - **Azure Pipelines**: No more HTTP 400 errors produced by poolName with spaces ([#5107](https://github.com/kedacore/keda/issues/5107))
 - **ScaledJobs**: Copy ScaledJob annotations to child Jobs ([#4594](https://github.com/kedacore/keda/issues/4594))
 
diff --git a/apis/keda/v1alpha1/triggerauthentication_webhook.go b/apis/keda/v1alpha1/triggerauthentication_webhook.go
index 72b14e1b388..449f6f1c53d 100644
--- a/apis/keda/v1alpha1/triggerauthentication_webhook.go
+++ b/apis/keda/v1alpha1/triggerauthentication_webhook.go
@@ -107,15 +107,24 @@ func isTriggerAuthenticationRemovingFinalizer(om metav1.ObjectMeta, oldOm metav1
 }
 
 func validateSpec(spec *TriggerAuthenticationSpec) (admission.Warnings, error) {
-	if spec.PodIdentity != nil {
-		switch spec.PodIdentity.Provider {
+	err := validatePodIdentityID(spec.PodIdentity)
+	return nil, err
+}
+
+func validatePodIdentityID(podIdentity *AuthPodIdentity) error {
+	if podIdentity != nil {
+		switch podIdentity.Provider {
 		case PodIdentityProviderAzure, PodIdentityProviderAzureWorkload:
-			if spec.PodIdentity.IdentityID != nil && *spec.PodIdentity.IdentityID == "" {
-				return nil, fmt.Errorf("identityid of PodIdentity should not be empty. If it's set, identityId has to be different than \"\"")
+			if isEmptyString(podIdentity.IdentityID) {
+				return fmt.Errorf("identityid of PodIdentity should not be empty. If it's set, identityId has to be different than \"\"")
 			}
 		default:
-			return nil, nil
+			return nil
 		}
 	}
-	return nil, nil
+	return nil
+}
+
+func isEmptyString(str *string) bool {
+	return str != nil && *str == ""
 }
diff --git a/pkg/scaling/resolver/scale_resolvers.go b/pkg/scaling/resolver/scale_resolvers.go
index 99eb4e9fb1f..6b0444f83d4 100644
--- a/pkg/scaling/resolver/scale_resolvers.go
+++ b/pkg/scaling/resolver/scale_resolvers.go
@@ -202,9 +202,6 @@ func ResolveAuthRefAndPodIdentity(ctx context.Context, client client.Client, log
 				// FIXME: Delete this for v2.15
 				logger.Info("WARNING: Azure AD Pod Identity has been archived (https://github.com/Azure/aad-pod-identity#-announcement) and will be removed from KEDA on v2.15")
 			}
-			if podIdentity.IdentityID != nil && *podIdentity.IdentityID == "" {
-				return nil, kedav1alpha1.AuthPodIdentity{Provider: kedav1alpha1.PodIdentityProviderNone}, fmt.Errorf("IdentityID of PodIdentity should not be empty")
-			}
 		default:
 		}
 		return authParams, podIdentity, nil