diff --git a/src/__testing__/ShareModalWireContract.test.tsx b/src/__testing__/ShareModalWireContract.test.tsx
index e1222954a..457474241 100644
--- a/src/__testing__/ShareModalWireContract.test.tsx
+++ b/src/__testing__/ShareModalWireContract.test.tsx
@@ -188,4 +188,63 @@ describe('ShareModal resource-access wire contract', () => {
     );
     expect(resourceAccessMutator).not.toHaveBeenCalled();
   });
+
+  it('surfaces host error text when visibility update fails with a string error', async () => {
+    const handleUpdateVisibility = jest
+      .fn()
+      .mockResolvedValue({ error: 'visibility rejected' });
+    const { props } = renderShareModal({
+      handleUpdateVisibility
+    } as Partial<ShareModalProps>);
+
+    fireEvent.mouseDown(document.getElementById('share-menu')!);
+    fireEvent.click(screen.getByRole('option', { name: 'Public' }));
+
+    await waitFor(() => expect(handleUpdateVisibility).toHaveBeenCalledWith('public'));
+    await waitFor(() =>
+      expect(props.notify).toHaveBeenCalledWith({
+        message: 'Failed to update visibility. visibility rejected',
+        event_type: 'error'
+      })
+    );
+  });
+
+  it('surfaces nested RTK error text when visibility update returns an error object', async () => {
+    const handleUpdateVisibility = jest
+      .fn()
+      .mockResolvedValue({ error: { error: 'permission denied' } });
+    const { props } = renderShareModal({
+      handleUpdateVisibility
+    } as Partial<ShareModalProps>);
+
+    fireEvent.mouseDown(document.getElementById('share-menu')!);
+    fireEvent.click(screen.getByRole('option', { name: 'Public' }));
+
+    await waitFor(() => expect(handleUpdateVisibility).toHaveBeenCalledWith('public'));
+    await waitFor(() =>
+      expect(props.notify).toHaveBeenCalledWith({
+        message: 'Failed to update visibility. permission denied',
+        event_type: 'error'
+      })
+    );
+  });
+
+  it('notifies success when visibility update succeeds', async () => {
+    const handleUpdateVisibility = jest.fn().mockResolvedValue({ error: '' });
+    const { props } = renderShareModal({
+      handleUpdateVisibility
+    } as Partial<ShareModalProps>);
+
+    fireEvent.mouseDown(document.getElementById('share-menu')!);
+    fireEvent.click(screen.getByRole('option', { name: 'Public' }));
+
+    await waitFor(() => expect(handleUpdateVisibility).toHaveBeenCalledWith('public'));
+    await waitFor(() =>
+      expect(props.notify).toHaveBeenCalledWith({
+        message: "Design 'My Design' is now public",
+        event_type: 'success'
+      })
+    );
+  });
 });
+
diff --git a/src/custom/ShareModal/ShareModal.tsx b/src/custom/ShareModal/ShareModal.tsx
index 8045d6694..7d92fdf24 100644
--- a/src/custom/ShareModal/ShareModal.tsx
+++ b/src/custom/ShareModal/ShareModal.tsx
@@ -174,6 +174,30 @@ export type ResourceAccessArg = {
   resourceAccessMappingPayload: ResourceAccessMappingPayload;
 };
 
+export type VisibilityUpdateError =
+  | string
+  | {
+      error?: string;
+      message?: string;
+      data?:
+        | {
+            message?: string;
+            [key: string]: unknown;
+          }
+        | string;
+      [key: string]: unknown;
+    };
+
+export type VisibilityUpdateResponse =
+  | {
+      error?: VisibilityUpdateError;
+      data?: unknown;
+      [key: string]: unknown;
+    }
+  | void
+  | null
+  | undefined;
+
 export interface ShareModalProps {
   /** Function to close the share modal */
   handleShareModalClose: () => void;
@@ -187,7 +211,7 @@ export interface ShareModalProps {
   fetchAccessActors: () => Promise<User[]>;
   /** Optional URL of the host application. Defaults to `null` if not provided */
   hostURL?: string | null;
-  handleUpdateVisibility: (value: string) => Promise<{ error: string }>;
+  handleUpdateVisibility: (value: string) => Promise<VisibilityUpdateResponse>;
   /**
    * @deprecated Unused - never read. The component defines its own
    * `handleShareWithNewUsers`, which shadows this prop and shares through
@@ -420,14 +444,28 @@ const ShareModal: React.FC<ShareModalProps> = ({
 
   const handleDelete = async (actor: User) => handleRevokeAccess([actor]);
 
-  /* eslint-disable @typescript-eslint/no-explicit-any */
-  const notifyVisibilityChange = (res: any, value: any) => {
+  const notifyVisibilityChange = (res: VisibilityUpdateResponse, value: string) => {
     const UPDATE_VISIBILITY_MSG = Array.isArray(selectedResource)
       ? `${startCase(dataName)}s (${selectedResource.length}) are now ${value}`
       : `${startCase(dataName)} '${selectedResource.name}' is now ${value}`;
-    const FAILED_TO_UPDATE_VISIBILITY_MSG = `Failed to update visibility. ${res?.error?.error || ''}`;
-
-    if (!res.error) {
+    const err = res && typeof res === 'object' && 'error' in res ? res.error : undefined;
+    const detail =
+      typeof err === 'string'
+        ? err
+        : typeof err === 'object' && err !== null
+          ? typeof err.error === 'string'
+            ? err.error
+            : typeof err.data === 'object' && err.data !== null && typeof err.data.message === 'string'
+              ? err.data.message
+              : typeof err.message === 'string'
+                ? err.message
+                : ''
+          : '';
+    const FAILED_TO_UPDATE_VISIBILITY_MSG = detail
+      ? `Failed to update visibility. ${detail}`
+      : 'Failed to update visibility.';
+
+    if (!err) {
       notify({
         message: UPDATE_VISIBILITY_MSG,
         event_type: 'success'
@@ -452,7 +490,8 @@ const ShareModal: React.FC<ShareModalProps> = ({
       setUpdatingVisibility(true);
       const res = await handleUpdateVisibility(value);
       notifyVisibilityChange(res, value);
-      if (!res?.error) {
+      const err = res && typeof res === 'object' && 'error' in res ? res.error : undefined;
+      if (!err) {
         setVisibility(value);
       }
     } finally {
diff --git a/src/custom/ShareModal/index.tsx b/src/custom/ShareModal/index.tsx
index e809d6422..b6915e1e5 100644
--- a/src/custom/ShareModal/index.tsx
+++ b/src/custom/ShareModal/index.tsx
@@ -8,5 +8,10 @@ export {
   type ResourceAccessActor,
   type ResourceAccessMappingPayload
 } from './resourceAccessPayload';
-export type { ResourceAccessArg, ShareModalProps } from './ShareModal';
+export type {
+  ResourceAccessArg,
+  ShareModalProps,
+  VisibilityUpdateError,
+  VisibilityUpdateResponse
+} from './ShareModal';
 export { ShareModal };
diff --git a/src/index.tsx b/src/index.tsx
index d104a9220..300b12218 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -140,7 +140,9 @@ export {
   type ResourceAccessActor,
   type ResourceAccessArg,
   type ResourceAccessMappingPayload,
-  type ShareModalProps
+  type ShareModalProps,
+  type VisibilityUpdateError,
+  type VisibilityUpdateResponse
 } from './custom/ShareModal';
 
 // Same nested-barrel dts-drop quirk as FeedbackButton above, and the whole