diff --git a/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.spec.ts b/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.spec.ts
index 9f14dd72c25..b83549a406e 100644
--- a/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.spec.ts
+++ b/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.spec.ts
@@ -18,6 +18,7 @@ import { DialogService } from 'app/modules/dialog/dialog.service';
 import {
   CloudCredentialsSelectComponent,
 } from 'app/modules/forms/custom-selects/cloud-credentials-select/cloud-credentials-select.component';
+import { IxInputHarness } from 'app/modules/forms/ix-forms/components/ix-input/ix-input.harness';
 import { IxSelectHarness } from 'app/modules/forms/ix-forms/components/ix-select/ix-select.harness';
 import { SlideIn } from 'app/modules/slide-ins/slide-in';
 import { SlideInRef } from 'app/modules/slide-ins/slide-in-ref';
@@ -335,7 +336,29 @@ describe('CloudSyncFormComponent', () => {
       }]);
       expect(slideInRef.close).toHaveBeenCalledWith({ response: existingTask, error: null });
     });
+
+    it('checks payload when use invalid s3 credentials', async () => {
+      spectator.component.isCredentialInvalid$.next(true);
+      spectator.detectChanges();
+
+      const bucketInput = await loader.getHarness(IxInputHarness.with({ label: 'Bucket' }));
+      await bucketInput.setValue('selected');
+
+      expect(spectator.component.getPayload()).toEqual(expect.objectContaining({
+        attributes: expect.objectContaining({
+          bucket: 'selected',
+        }),
+      }));
+
+      await bucketInput.setValue('test-bucket');
+      expect(spectator.component.getPayload()).toEqual(expect.objectContaining({
+        attributes: expect.objectContaining({
+          bucket: 'test-bucket',
+        }),
+      }));
+    });
   });
+
   describe('doesnt load buckets when user doesnt has roles', () => {
     beforeEach(() => {
       spectator = createComponent({
diff --git a/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.ts b/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.ts
index e09b137826b..a64da89273e 100644
--- a/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.ts
+++ b/src/app/pages/data-protection/cloudsync/cloudsync-form/cloudsync-form.component.ts
@@ -12,6 +12,7 @@ import { UntilDestroy, untilDestroyed } from '@ngneat/until-destroy';
 import { TranslateService, TranslateModule } from '@ngx-translate/core';
 import { find, findIndex, isArray } from 'lodash-es';
 import {
+  BehaviorSubject,
   EMPTY,
   Observable, forkJoin, of,
 } from 'rxjs';
@@ -164,6 +165,7 @@ export class CloudSyncFormComponent implements OnInit {
     bwlimit: [[] as string[]],
   });
 
+  isCredentialInvalid$ = new BehaviorSubject(false);
   isLoading = false;
   bucketPlaceholder: string = helptextCloudSync.bucket_placeholder;
   bucketTooltip: string = helptextCloudSync.bucket_tooltip;
@@ -268,6 +270,16 @@ export class CloudSyncFormComponent implements OnInit {
 
   ngOnInit(): void {
     this.getInitialData();
+
+    this.isCredentialInvalid$.pipe(untilDestroyed(this)).subscribe((value) => {
+      if (value) {
+        this.form.controls.bucket_input.enable();
+        this.form.controls.bucket.disable();
+      } else {
+        this.form.controls.bucket_input.disable();
+        this.form.controls.bucket.enable();
+      }
+    });
   }
 
   setupForm(): void {
@@ -427,14 +439,12 @@ export class CloudSyncFormComponent implements OnInit {
           }
           this.bucketOptions$ = of(bucketOptions);
           this.isLoading = false;
-          this.form.controls.bucket.enable();
-          this.form.controls.bucket_input.disable();
+          this.isCredentialInvalid$.next(false);
           this.cdr.markForCheck();
         },
         error: (error: unknown) => {
           this.isLoading = false;
-          this.form.controls.bucket.disable();
-          this.form.controls.bucket_input.enable();
+          this.isCredentialInvalid$.next(true);
           this.dialogService.closeAllDialogs();
           this.cdr.markForCheck();
           const apiError = extractApiError(error);
@@ -637,7 +647,8 @@ export class CloudSyncFormComponent implements OnInit {
     }
   }
 
-  prepareData(formValue: FormValue): CloudSyncTaskUpdate {
+  getPayload(): CloudSyncTaskUpdate {
+    const formValue = this.form.value;
     const attributes: CloudSyncTaskUpdate['attributes'] = {};
 
     const value: CloudSyncTaskUpdate = {
@@ -709,6 +720,8 @@ export class CloudSyncFormComponent implements OnInit {
       if (formValue[name] !== undefined && formValue[name] !== null && formValue[name] !== '') {
         if (name === 'task_encryption') {
           attributes[name] = formValue[name] === '' ? null : formValue[name];
+        } else if (name === 'bucket_input') {
+          attributes.bucket = formValue[name];
         } else {
           attributes[name] = formValue[name];
         }
@@ -721,7 +734,7 @@ export class CloudSyncFormComponent implements OnInit {
   }
 
   onDryRun(): void {
-    const payload = this.prepareData(this.form.value);
+    const payload = this.getPayload();
     this.dialogService.jobDialog(
       this.api.job('cloudsync.sync_onetime', [payload, { dry_run: true }]),
       { title: this.translate.instant(helptextCloudSync.job_dialog_title_dry_run) },
@@ -734,7 +747,7 @@ export class CloudSyncFormComponent implements OnInit {
   }
 
   onSubmit(): void {
-    const payload = this.prepareData(this.form.value);
+    const payload = this.getPayload();
 
     this.isLoading = true;
     let request$: Observable<unknown>;
diff --git a/src/app/pages/data-protection/cloudsync/cloudsync-wizard/steps/cloudsync-what-and-when/cloudsync-what-and-when.component.ts b/src/app/pages/data-protection/cloudsync/cloudsync-wizard/steps/cloudsync-what-and-when/cloudsync-what-and-when.component.ts
index 42aa731bfbd..f33eb454757 100644
--- a/src/app/pages/data-protection/cloudsync/cloudsync-wizard/steps/cloudsync-what-and-when/cloudsync-what-and-when.component.ts
+++ b/src/app/pages/data-protection/cloudsync/cloudsync-wizard/steps/cloudsync-what-and-when/cloudsync-what-and-when.component.ts
@@ -279,7 +279,7 @@ export class CloudSyncWhatAndWhenComponent implements OnInit, OnChanges {
         if (name === 'task_encryption') {
           attributes[name] = formValue[name] === '' ? null : formValue[name];
         } else if (name === 'bucket_input') {
-          attributes['bucket'] = formValue[name];
+          attributes.bucket = formValue[name];
         } else {
           attributes[name] = formValue[name];
         }