L2 Firewall rule to log PPPoE Discovery

So I set an L2 firewall rule on a 2.4Ghz ePMP 1000 GPS Sync AP in bridge mode.

Name: Log PPPoE Descovery

Action: Accept

Interface: WLAN

Log: ON

EtherType: 8863

Customer radios are configured to NAT/DHCP and PPPoE  Enabled  so I was thinking this rule should cause the AP to log whenever a connected radio sends a PPPoE descovery packet however it does not appear to be doing that.