diff --git a/test/e2e/parallel/spacebindingrequest_test.go b/test/e2e/parallel/spacebindingrequest_test.go
index 4d02fc893..8c6193cd6 100644
--- a/test/e2e/parallel/spacebindingrequest_test.go
+++ b/test/e2e/parallel/spacebindingrequest_test.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"sort"
 	"testing"
+	"time"
 
 	toolchainv1alpha1 "github.com/codeready-toolchain/api/api/v1alpha1"
 	"github.com/gofrs/uuid"
@@ -192,10 +193,10 @@ func TestUpdateSpaceBindingRequest(t *testing.T) {
 		require.NoError(t, err)
 	})
 
-	t.Run("update space binding request MasterUserRecord", func(t *testing.T) {
+	t.Run("update space binding request MasterUserRecord is denied", func(t *testing.T) {
 		// when
 		space, spaceBindingRequest, _ := NewSpaceBindingRequest(t, awaitilities, memberAwait, hostAwait, "admin")
-		// let's create another MUR that will have access to the space
+		// let's create another MUR that will be used for the update request
 		username := uuid.Must(uuid.NewV4()).String()
 		_, newmur := NewSignupRequest(awaitilities).
 			Username(username).
@@ -205,24 +206,26 @@ func TestUpdateSpaceBindingRequest(t *testing.T) {
 			RequireConditions(ConditionSet(Default(), ApprovedByAdmin())...).
 			NoSpace().
 			WaitForMUR().Execute(t).Resources()
-		// and we update the MUR in the SBR
-		_, err := memberAwait.UpdateSpaceBindingRequest(t, types.NamespacedName{Namespace: spaceBindingRequest.Namespace, Name: spaceBindingRequest.Name},
+		// and we try to update the MUR in the SBR
+		// with lower timeout since it will fail as expected
+		_, err := memberAwait.WithRetryOptions(TimeoutOption(time.Second*2)).UpdateSpaceBindingRequest(t, types.NamespacedName{Namespace: spaceBindingRequest.Namespace, Name: spaceBindingRequest.Name},
 			func(s *toolchainv1alpha1.SpaceBindingRequest) {
 				s.Spec.MasterUserRecord = newmur.GetName() // set to the new MUR
 			},
 		)
-		require.NoError(t, err)
+		require.Error(t, err) // an error from the validating webhook is expected when trying to update the MUR field
+		require.EqualError(t, err, "admission webhook \"users.spacebindingrequests.webhook.sandbox\" denied the request: SpaceBindingRequest.MasterUserRecord field cannot be updated. Consider deleting and recreating the SpaceBindingRequest resource")
 
 		//then
 		// wait for both SpaceBindingRequest and SpaceBinding to have same MUR
 		spaceBindingRequest, err = memberAwait.WaitForSpaceBindingRequest(t, types.NamespacedName{Namespace: spaceBindingRequest.GetNamespace(), Name: spaceBindingRequest.GetName()},
 			UntilSpaceBindingRequestHasConditions(spacebindingrequesttestcommon.Ready()),
 			UntilSpaceBindingRequestHasSpecSpaceRole(spaceBindingRequest.Spec.SpaceRole),
-			UntilSpaceBindingRequestHasSpecMUR(newmur.GetName()), // new MUR
+			UntilSpaceBindingRequestHasSpecMUR(spaceBindingRequest.Spec.MasterUserRecord), // MUR should be the same
 		)
 		require.NoError(t, err)
 		_, err = hostAwait.WaitForSpaceBinding(t, spaceBindingRequest.Spec.MasterUserRecord, space.Name,
-			UntilSpaceBindingHasMurName(newmur.GetName()), // has new MUR
+			UntilSpaceBindingHasMurName(spaceBindingRequest.Spec.MasterUserRecord), // MUR should be the same
 			UntilSpaceBindingHasSpaceName(space.Name),
 			UntilSpaceBindingHasSpaceRole(spaceBindingRequest.Spec.SpaceRole),
 		)
diff --git a/testsupport/wait/member.go b/testsupport/wait/member.go
index 306d3b95b..3dab3c456 100644
--- a/testsupport/wait/member.go
+++ b/testsupport/wait/member.go
@@ -1426,7 +1426,7 @@ func (a *MemberAwaitility) UpdateSpaceBindingRequest(t *testing.T, spaceBindingR
 		modifySpaceBindingRequest(freshSpaceBindingRequest)
 		if err := a.Client.Update(context.TODO(), freshSpaceBindingRequest); err != nil {
 			t.Logf("error updating SpaceBindingRequest '%s' in namespace '%s': %s. Will retry again...", spaceBindingRequestNamespacedName.Name, spaceBindingRequestNamespacedName.Name, err.Error())
-			return false, nil
+			return false, err
 		}
 		sr = freshSpaceBindingRequest
 		return true, nil
@@ -2303,6 +2303,28 @@ func (a *MemberAwaitility) verifyUsersRolebindingsWebhookConfig(t *testing.T, ca
 	assert.Equal(t, []string{"checlusters"}, checlusterRule.Resources)
 	assert.Equal(t, admv1.NamespacedScope, *checlusterRule.Scope)
 
+	spacebindingrequestWebhook := actualValWbhConf.Webhooks[2]
+	assert.Equal(t, "users.spacebindingrequests.webhook.sandbox", spacebindingrequestWebhook.Name)
+	assert.Equal(t, []string{"v1"}, spacebindingrequestWebhook.AdmissionReviewVersions)
+	assert.Equal(t, admv1.SideEffectClassNone, *spacebindingrequestWebhook.SideEffects)
+	assert.Equal(t, int32(5), *spacebindingrequestWebhook.TimeoutSeconds)
+	assert.Equal(t, admv1.Ignore, *spacebindingrequestWebhook.FailurePolicy)
+	assert.Equal(t, admv1.Equivalent, *spacebindingrequestWebhook.MatchPolicy)
+	assert.Equal(t, codereadyToolchainProviderLabel, spacebindingrequestWebhook.NamespaceSelector.MatchLabels)
+	assert.Equal(t, ca, spacebindingrequestWebhook.ClientConfig.CABundle)
+	assert.Equal(t, "member-operator-webhook", spacebindingrequestWebhook.ClientConfig.Service.Name)
+	assert.Equal(t, a.Namespace, spacebindingrequestWebhook.ClientConfig.Service.Namespace)
+	assert.Equal(t, "/validate-spacebindingrequests", *spacebindingrequestWebhook.ClientConfig.Service.Path)
+	assert.Equal(t, int32(443), *spacebindingrequestWebhook.ClientConfig.Service.Port)
+	require.Len(t, spacebindingrequestWebhook.Rules, 1)
+
+	spacebindingrequestRule := spacebindingrequestWebhook.Rules[0]
+	assert.Equal(t, []admv1.OperationType{admv1.Create, admv1.Update}, spacebindingrequestRule.Operations)
+	assert.Equal(t, []string{"toolchain.dev.openshift.com"}, spacebindingrequestRule.APIGroups)
+	assert.Equal(t, []string{"v1alpha1"}, spacebindingrequestRule.APIVersions)
+	assert.Equal(t, []string{"spacebindingrequests"}, spacebindingrequestRule.Resources)
+	assert.Equal(t, admv1.NamespacedScope, *spacebindingrequestRule.Scope)
+
 }
 
 func (a *MemberAwaitility) WaitForAutoscalingBufferApp(t *testing.T) {