TCPDump, able to see tunneled credentials?

Hi All, I'm a bit confused here. I've got EAP-TTLS/PAP set up. To ensure that everything was setup correctly, I have run a PCAP from the supplicant to see if I could see any auth details being sent (I couldn't), I have also run a PCAP from an AP in sniffer mode (also couldn't see anything, only probes and broadcasts), however, I ran a TCPDump on the RADIUS server itself and while I couldn't see the password that was being sent, I could see the tunnelled username and VLAN attributes in the Access-Accept. My question is, is this expected? Want to ensure this isn't just a misconfiguration. Kind regards, Connor