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During a recent Citrix Workspace App update, I encountered interesting behavior involving Microsoft Teams SlimCore.
The Microsoft Teams VDI Plugin was already installed on the client. Workspace App was then updated using /CleanInstall.
Initially, everything looked fine:
Citrix Workspace App ✔️
Teams VDI Plugin ✔️
Software deployment ✔️
Nevertheless, SlimCore optimization no longer worked.
The investigation revealed that the required DLLs were no longer present in the ICA Client directory, although the Teams VDI Plugin still appeared as installed under Apps & Features.
That is precisely what makes this issue interesting.
If an automated CWA update checks only installation status, you get a successful deployment even though the actual Teams optimization no longer works.
For my update tests, this means:
CWA version → Teams VDI Plugin → DLLs → SlimCore → actual optimization mode
must be checked together.
Especially with the increasing move to SlimCore, I believe this functional test should be part of a CWA/Teams update.
👉 Finding in the Wild: installed does not automatically mean operational.
These issues are exactly why I do not just install Citrix updates, but also check the relevant functions afterwards.
Finding in the Wild: I will keep investigating.
