The 14 October maintenance was meant to distribute the rewards for four past campaigns:
The first three of these appeared in our Visiphone as detailed in their announcements, alongside a trigger provided by a new campaign and compensation for the player shop outage:
However the Battle It Out! rewards were not. Specifically, this was meant to provide up to three SG Tickets depending on the highest rank players reached:
I've confirmed with multiple other players who were higher than Rank A5 before the start of the campaign and did not fall below A5 during the campaign period; they have all not received any rewards for this campaign.
Meanwhile I began campaign as Rank B2 and was A5 at the beginning of the 15 September maintenance; I also received nothing. This rules out the possible requirement to rank up into one of the listed ranks during the campaign period to qualify for the reward.
I've submitted a support contact request for this issue (tracking number 63522).