Distributed L3 Roaming or L3 Roaming with a Concentrator?That will dictate where to start looking if it is the second option involving a MX.
Is VLAN 20 present on the switchports connecting to the APs? You have APs in various areas tagged and then mapped to VLANs based on location in the VLAN ID section below the L3 area of the SSID page? Maybe post a screenshot.
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