Re:

I have confirmed from the team and there's nothing blocking freeradius to reach the WLC. The WLC is open to everything in the organisation. The packets are reaching freeradius as I can see an "Access-Request" on FreeRadius (from radsniff and tcpdump). Attaching a screenshot for reference.

From your tcpdump and radsniff you only see the packet(s) comming to ens160 not to freeradius. Your freeradius is listening on localhost, right? -- Ludo