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I think I had a different problem (which is technically not a bug, just annoying): there were so many people at the world boss I went to first, and so many of them were spamming ultimates like their life depended on it, that I apparently didn't do enough damage to get loot from the boss, and that excluded me from getting the tickets as well.
I went to a less popular boss and got tickets from that one.
PC EU player | She/her/hers | PAWS (Positively Against Wrip-off Stuff) - Say No to Crown Crates!
"Remember in this game we call life that no one said it's fair"
I had a similar issue. I soloed 5 world bosses, did several delves, and cleared 6 dolmens before it recognized me as participating in the event. Just go on playing the game normally or clear some Golden Pursuit quests. Eventually it'll start working.