Ah that explains it. 

Apparently it still gives out the reward because I just did one and I got the tickets even though it did not show up on the map

The issue is known as playing too much. 

You have 10 storm alerts/daily

Did you run out of alert cooldowns?

Check StormShieldOne

You will have to wait until your cooldowns are done.   You can check stormshield.one to see when that is for you.  

Yep, I just do another mission or wait some time and there will be again...

Is anyone else having the same issue?

EDIT: I did a mission that was supposed to give tickets according to stormshield.one, and I still got them at the end. I looked at the mat afterward and the rewards were displayed again, so it must have been a glitch.

Birthday tickets and Perk-ups no longer showing on any mission on the map after the latest mission refresh