Office Add-ins known issues

Last updated November 7, 2025

This article provides information about current known issues with Office Add-ins. For more information about common error messages you might encounter, see Troubleshoot user errors with Office Add-ins or contact the add-in developer on the Details + support tab on the add-in's detail page in Microsoft Marketplace.

Active issues in Office add-ins

Outlook: Users may experience delays of up to ten seconds loading signature add-in images in Exchange Online

STATUS

We've determined that a recent update to an authentication component of attachment logging introduced a regression which is resulting in impact. We're reverting this update to resolve the issue.

Tracking ID: 706911563

IMPACT

Some users may experience delays of up to ten seconds loading images in Exchange Online. This section will be updated as our investigation continues.

START TIME

Monday, November 3, 2025, at 4:31 PM UTC

Outlook: Delays loading inline images in email signatures in the new Outlook for Windows and Outlook for the web

We're currently investigating reports from Outlook users who are experiencing loading delays of inline images in email signatures when using the new Outlook for Windows and Outlook for the web. Our findings indicate that this is a server-side performance issue that affects rendering of all inline images. Attempting to send messages while the images are not yet loaded results in the following dialog box.

Tracking ID: 678890927

Client version: 20250822005.18

STATUS

We're still receiving isolated reports from some users regarding this previously resolved issue. While the issue has been largely mitigated, certain users in specific regions are still experiencing inline signature images loading slowly and the blocking dialog during email send. Because this stems from a server-side performance delay, the impact varies by customer and region. Those affected may see delays when loading inline images—particularly in scenarios involving signature add-ins. We're actively investigating this issue with highest priority.

WORKAROUND

Options:

1. Remove inline images from signature.
2. Wait for images to load before sending the file.
3. Switch to classic Outlook for Windows or Outlook for Mac.

Centrally deployed add-in error "You don't have permission to use this add-in"

Numerous customers report that after updating Office from 2505 to 2507 their add-in will not load and an error is displayed "You don't have permission to use this add-in. Contact your system administrator." Any add-in may reproduce this issue; it is not specific to a single add-in.

Tracking ID: 667052546

Version affected: Office Monthly Enterprise 2507

STATUS

A fix is being deployed.

WORKAROUND

Option 1: Refresh admin-managed add-ins

1. Select Home > Add-ins in the ribbon.
2. Select More add-ins.
3. Go to the Admin Managed tab.
4. Select the Refresh button in top right.
5. The add-in should reappear. Open it to reload the add-in.

Option 2: Forced admin refresh

IT admins can force the add-ins to refresh by creating the following registry key.

Key: HKCU\Software\Microsoft\Office\16.0\WEF\TrustedCatalogs\ClearInstalledExtensions Value: DWORD = 1

Excel: Increased frequency of RichApi.Error: Error code: 0xF5320001

Date reported: 09/04/2025

Since late August, customers are seeing an increase in RichApi.Error 0xF532001 in their error telemetry. This error happens only when the Office.ribbon.requestUpdate API is called immediately after the Office.ribbon.requestCreateControls API is called.

Tracking ID: 10529994

GitHub issue: Increased frequency of RichApi.Error code 0xF5320001

STATUS

We're currently working on a fix.

WORKAROUND

Options:

1. When you make the initial requestCreateControls call, include the enabled/disabled state, if known. Instead of making two calls one right after the other, do it in one call.
2. Roll back Office from version 2508 to 2507.

Recently resolved issues in Office Add-ins

Excel: RichApi.Error code 0x8002802B known as hrNotFound is occurring more frequently when not expected

Date reported: 09/17/2025

Users might experience failures when executing Excel grid operations initiated through add-in commands on the ribbon or context menu. This issue occurs primarily when users have Custom Functions.

Platform affected: Windows Desktop

STATUS

Date fixed: 09/26/2025

Users should upgrade Excel to 2508 (19127.20264) or later for the fix.

See also

• For more information about resolved issues in Office Add-ins, see the Office-js closed issues in GitHub.