I had the same issue with the Mysterious Scrolls last week on some days, it's just pure RNG. Keys worked fine for me today, still didn't get 10 but I had used over 200 stamina before the update so not surprising.

Sure, it could be rng, I just don't see how. This 200 energy and no keys period. It seems more likely that there is an issue with the code after the update. Once again, I would point to the plunder/convoy issues as correlation- while not proof of the keys issue, it is proof that there is an accepted error in the system post update. Post in Bug section adds to this. I'm kind of expecting more bugs with evening activities.

Its meant to be where you can't get 10 keys without spending ingots on stamina

This is not the first time we've had this event, nor has that ever been a requirement in the past. It's meant to require you to spend coups/ingots to get additional keys to fully purchase an upgrades/ninjas, but the additional stamina is not the issue. I have held off on using stam pots, literally because I think it is bugged. 200 stam and no keys is a sign of a bug. Evidence to the contrary would be players using stam and getting keys. It might be that plot instances are bugged or that around the time of convoy (when convoy and plunder got bugged) this was also affected. I used the 200 stam shortly after 13:00 100 stam gift, which was also after the convoy/plunder. So, give me more data to support your opinions please. Not saying I'm right, but I'm certainly afraid that there is a bug based on my evidence. Please provide more.

I got about 7 keys with 300 worth of stamina right after the maintenance yesterday. I'll run again today to see how it works out later. Is anyone on your server experiencing it too?

We're aware of the convoy and plunder bug.

I believe that there's no such thing. Stop assuming it.

I'm having the same thing happen to me.

I believe the drop rate for keys are really low, I just got 5 keys from 26 runs. What server are you all from?

5 keys after 400 stamina used, unlucky.

Assumptions are based off of how the game generally works, such as the way recruit pulls in this game work, trial breakthrough rewards, sweep reward algorithm etc. I don't think I will get 10 keys a single day out of the 7 with just idle stamina alone cause its just too 'rare'.

Same here lol

ok, now I'm starting to think it's a bug as well. I'm also at exactly 5 keys all day which seems to be the magic number

took me over 400 to get 3

Hmm, kind of thought I was the only one. Used 400 stamina and got 6, combine this with the plunder convoy bug and I'm not having the best day in Naruto today. I obviously can't say for certain if there is anything wrong, but maybe look into it. I don't mind spending coupons to get extra keys, but not even being able to get the 10 is a real bummer for a player trying to make the most of his resources in this game.

I got 23 points today i think i had about 6-7 keys with over 500 stamina.

800 total stamina, got my 10 keys lol.

1 key for 250stamina :@

Okay, I'll feedback to the team about this.

There is no bugs with the keys drop. There are players who got about 8~ keys with 380 stamina. Which server are you guys from though?