I had an issue yesterday trying to secure a DUB-BRU redemption for next year. All flights showing available with plenty of seats but for some reason the combination I wanted kept failing when I went to confirm and dumped me out on to a screen saying there is no availability for the dates I selected, which was clearly wrong as if I tried a combination on the same day but different times I could get through to the booking window.

Trying BA gave me the option to book the one I wanted but BA wanted an extra €50 in charges (only €50 on avios.com but €100 on BA with same avios required). Tried to call avios but gave up as it was taking too long.