Okay, I figured it out. I configured the port for sFlow (6343) instead of NetFlow (2055) and "ip ffe" needs to be configured on the interface
Seems the Total Access 908e routers, NetVanta 5600 routers and all other Adtran routers only support NetFlow and not sFlow.
EDIT (Working Config):
ip flow export destination 192.168.x.x 2055 source gig 0/5.1 (I am sourcing only on the WAN interface so I can exclude internal traffic)
ip flow export template timeout-rate 5
ip flow cache timeout active 1
int gig 0/5.1
ip ffe (must be entered in order for this to work. If you do a sho run, it will not be shown but if you do a "sho ip ffe" then you'll see it's enabled.)
ip flow ingress
ip flow egress
This is a good posting just in case any one else wonders.
BTW I am using LogicMonitor as my external source.