After a recent exploit emerged, the mission has been pulled from online play.
After an exploit was revealed for the same which allowed you to quickly farm money and RP from completing the job, the Rooftop Rumble mission for Grand Theft Auto Online has been pulled by Rockstar.
Rockstar issued an official statement on the same on a Q&A blog, stating that, “We are currently working on fixing an issue with Rooftop Rumble, and expect it to be available again within the next week. Apologies for any inconvenience.
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Though Rockstar hasn’t confirmed whether it was the exact above exploit that facilitated pulling the mission from GTA Online, the timing is more than a coincidence. We’ll know for sure when it comes back online and whether the exploit still works (or not) so stay tuned.