because i do not wanted to waste diamonds i have only tested it with a test account the last two dark tower events to see if the bug was fixed or not.
reddit posts from other users about this issue:
https://www.reddit.com/r/FapTitansPlayers/comments/17sdlvu/dt_quest_final_reward...
https://www.reddit.com/r/FapTitansPlayers/comments/183fn9a/dark_tower_reward/
my test account: userId = 250335564 (i hope this is the game id, if not then please let me know where i can find it)
btw, this account also has a registration bug that causes that the account is only partly registered (joining clans is possible but joining faption wars is not). this registration bug happens often, had to create multiple accounts till the registration was fully working. some friends told me that they had the same issue too. this registration bug has nothing to do with the dark tower hero claiming bug because this also does not work on properly activated accounts.
i also have to mention that the xxxmas celebration pass is bugged too (claim button disappears or does not show up at all):
1. properly unlocked
2. not claimed and no claim button
3. all quests are done
edit: it is totally random, some accounts can claim all gifts, sometimes only some can be claimed, sometimes none can be claimed. could not recreate this bug, so i can not say under what circumstances it happenes.