Add-ins not detected

installationadd-ins

Symptoms

The Add-ins page shows fewer add-ins than you know are installed.
A specific add-in doesn't appear in Deck.
The add-in count changes unexpectedly.

Solutions

Verify the add-in is registered

Open Registry Editor (regedit) and check for the add-in under one of the paths Deck scans:

HKCU\Software\Microsoft\Office\16.0\<app>\Addins\
HKCU\Software\Microsoft\Office\<app>\Addins\           (non-versioned)
HKLM\Software\Microsoft\Office\16.0\<app>\Addins\
HKLM\Software\WOW6432Node\Microsoft\Office\16.0\<app>\Addins\   (32-bit)

where <app> is Excel, Outlook, Word, or PowerPoint. The add-in's subkey name is its ProgID. The full list of scanned paths is in Registry Details.

Check the Office version

Deck scans the Office 16.0 family, which covers Office 2016, 2019, 2021, 2024, and Microsoft 365. Office 2013 and earlier use different registry paths that Deck doesn't scan.

Check whether an app is filtered by policy

If your organization set the AllowedOfficeApps policy, add-ins for apps not on the list are hidden intentionally. Confirm the app is allowed:

(Get-ItemProperty "HKLM:\SOFTWARE\Policies\Vediram\Deck" -ErrorAction SilentlyContinue).AllowedOfficeApps

See the Policy Reference.

Re-scan add-ins

Open Deck Settings and click Clear data to force a full re-scan of the registry.

Check HKLM for admin-managed add-ins

System-wide add-ins live under HKLM. Deck reads these but shows them read-only, with a lock icon - they can't be toggled from Deck.

Run diagnostics

Use the Diagnostics page to find registry integrity issues (orphaned or duplicate registrations) that can prevent detection. See Diagnostics.