Forgive me if the answer to my query is blatantly obvious....I'm not getting any younger you know!!

When searching for LCG - GLA reward seats over a range of dates months in advance all I ever get is ''Sorry, we can’t find availability''. Yet when searching each sector individually it returns plenty of award space easily complying with MCT. Is their a reason for this?

Sorry...LCG is A Coruna and GLA is the best city in the world.