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Ivanti noticed the same thing, in this article they say both methods are needed, even in newer versions of citrix. https://forums.ivanti.com/s/article/Best-Known-Method-UWM-Exclusions-for-Citrix-Hooks?language=en_US

cheers i managed to get it sorted they was setting UviProcessExcludes via GPP registry but normally after adding a process to UviProcessExcluded it requires a reboot. As they was using PVS i booted the Vdisk into MM and baked it into the image and rebooted and sealed and promoted. Now i dont see the Mfaphook64.dll in use when using Excel.exe

ah good to know, cheers