Anyone here with experience with old Cambium equipment?

I have a bunch of legacy Cambium equipment I'm dealing with that is not adhering to my modern network knowledge, so here is the background:

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Got a Cambium master AP at a main office. Have a Cambium AP at a satellite location. Both are PMP320s. These are configured for a VLAN.

These two connect just fine, and I can hit the AP anywhere on my network downlink to it.

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Behind the AP at the satellite location is a Cisco SG300 switch. It has two VLANs (an uplink and a downlink) two IP4 interfaces defined (one for the uplink, the other for the local subnet). The port the 320 plugs into is defined as a trunk.

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I cannot see the switch past the AP no matter if I change my VLAN id to match the one on the AP or just keep it the ID it was. None of my traffic on the downlink VLAN is tagged.

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Supposedly, the Cambiums are supposed to take untagged traffic and tag it going on the uplink and vice versa. The AP Cambium is in bridge mode, not NAT mode, as that would not work for this application.

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I feel like I have to configure a static route or something on this switch to get it past the AP, but my gut is telling me something is still not configured right on this Cambium and information is scant on them, even the Cambium forum admins state that most of the guys that worked on this legacy Wimax equipment have moved on.