Option 82 problems over VLANs

We’re trying to bring up Option 82 support on Sonar v2 for MDUs that have a MikroTik router and multiple MikroTik customer switches (e.g. CRS125 & CRS326). It works in the lab when the customer switch is directly connected to a router port but when the switch is on vlan 120 the option 82 packets don’t get through.

Has anyone seen this?
Any ideas?

Currently all our MDU customers are on a vlan. It would be annoying to have to reconfigure every building.

In the Mikrotik, does the agent remote id show anything at all? You might have to enable this column by going to DHCP Leases page and adding the agent remote id column.