I had Tenrai quests, but yesterday and today, they disappeared. Does not matter how many I complete or if I swap, I simply do not get any Tenrai quests. :*( It has been 2 days now and I am very frustrated.
Presently, for this week of it anyway, (could change beta and feedback contingent maybe)
You only got a max of 7 of those challenges. There are 5 planned weeks of it presently spread out through season 1 battle pass.
What tier of the Tenrai pass have you reached?
If you have made it to 7, then you have maxed out the available challenges for this event, and will have to wait until January to progress more.
Its the only reason I can think they have disappeared, then than a bug.
Thanks for the info. But I reached only 4. I have since completed 2 more quests and now I have one again… 
You can also view your upcoming challenges and see which order your next Tenrai quests will arrive and what they are.
Ahhhh, I think its because they are in your ‘upcoming challenges’ section.
If your on Console, press Y to see the upcoming Weeklies.
Unlike MCC, Infinite only lets you work on a few challenges at a time, which kinda sucks because after you’ve done a couple of Event Challenges, you have to go hop into other modes to complete standard challenges before another Event one drops in.