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Microsoft Teams works inside the Citrix session, but the new SlimCore optimization is not activated?
Instead, it shows:
❌ Citrix SlimCore Media Not Connected
⚠️ Citrix HDX Optimized (Legacy WebRTC)
The cause is not necessarily the VDA or Citrix itself!
🔎 Where can I find the error codes?
Inside Teams on the VDA:
CTRL + ALT + SHIFT + 1
Open the generated diagnostic archive in the Downloads folder:
PROD-WebLogs-*.zip → Core → vdi_debug.txt
Look for the following entries:
loadErrc and deployErrc
The key error codes:
* 2000 / 16002: Teams VDI Plugin is missing or was not loaded.
* 2003 / 16026: Citrix Virtual Channel Allow List blocks MSTEAMS, MSTEAM1 or MSTEAM2.
* 2004 / 16032: Citrix Workspace App is incompatible.
* 3002 / 24018: SlimCore could not be downloaded to the endpoint.
* 1460 / 11683: Timeout starting MsTeamsVdi.exe.
* 1722 / 13779: RPC/App Readiness issue.
* 16389: MSIX installation failed, often due to Intune policies or AppLocker/WDAC.
🛠️ My troubleshooting approach
1. Examine vdi_debug.txt and identify the error code.
2. Check whether MsTeamsVdi.exe is running on the endpoint.
3. Use Process Explorer to check whether MsTeamsPluginCitrix.dll is loaded into wfica32.exe.
4. Check the Citrix Virtual Channel Allow List.
5. For MSIX errors, investigate the AppXDeployment-Server and AppxPackagingOM Windows logs.
💡 The actual finding:
With SlimCore, Microsoft moves media processing to the local endpoint.
AppLocker, Intune, MSIX, a proxy or Windows App Readiness may therefore prevent Teams optimization even when Citrix is fully functional.
Before reinstalling the VDA, check vdi_debug.txt!
📖 My detailed Teams VDI guide:
📚 Microsoft troubleshooting:
