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No, not for teams.

i have a client who added zoom to the list but now Teams doesn't work

Not for teams. Unless it changed, and I am unaware.

Nope

they have a ticket open with citrix but they haven't been much help.

Create a test policy and disable the virtual channel security feature and apply it to a user or whoever you can test with. Then give teams a go. This way you can rule it out. Also look in the event logs on the vda. Event log section https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/secure/virtual-channel-security.html