Okay, if your VLANs on the switch are sorted the tagging is enabled on this port it should just be a matter of setting up the appropriate virtual interfaces on the ethernet device. This is pretty much up to the system admin of that system. If they said it worked on a different brand of switch then you could try using that. But personally, I have not had any issues with Meraki or CISCO switches and this kind of tagging to a device (even using VMWare / other virtualisation software). I would suggest that if you have a macOS device floating around, (BSD backend) not sure what system you are using. Then you could try setting up VLANS on the ethernet interface. It is straight froward and you can do it all from the GUI (network settings). Could be worth a try!
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