hmmm, none of the above helped... in the end, I increased the maximum number of monitors to 4... and rebooted the VM. connected to it and it was fine... it was certainly a problem with the VM as it would not work in multiple monitors on either the PC client of the Mac client... which is strange as my VM was cloned from the same base VM as my colleague however his worked immediately and mine didn't. Not sure if the changing max monitors to 4 helped or not, but whenever I looked at device manager in the guest, it only showed one monitor.
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