Originally Posted by ffsim

You need to look for "X" availability for an economy reward seat (or "I" for business). Doing a quick search on EF, it looks like 1218 is J7 I0 Y8 X0 while 1219 is J2 I0 Y2 X0.

J7Y8 on the outbound means there are 7 business class seats and 8 economy class seats available for sale on your outbound while J2 Y2 means there's a pair of each available on the return. Not much of a surprise that there are no rewards available for either flight.