If Zoom VDI won't work with Citrix it probably needs to be at a specific version instead of the latest and greatest, which is usually what's in AUR. This doc shows how to modify the AUR PGKBUILD to build the specific version that may work for you.
Figure out your necessary package verison and sub-package version, possibly by looking at the URL for the Windows or Mac version as provided by your firm. This doc assumes you need version 6.0.14 and sub-package version 25360.
First install Citrix with yay -S icaclient
. Copy its certs over to your home directory as the instructions say at the end of the install.
mkdir -p $HOME/.ICAClient/cache
cp /opt/Citrix/ICAClient/config/{All_Regions,Trusted_Region,Unknown_Region,canonicalization,regions}.ini $HOME/.ICAClient/
Run yay -S zoom-citric-plugin
to begin the AUR install process, but quit out at the first prompt instead of proceeding with the install as that would install the latest version, not the one you need.