In order to address a bug, we have disabled a part of Keystone Master.
At this time, players will not get the Draconic Mark of Mastery from completing Keystone Master. Once we re-enable it, the fix will be retroactive.
Thank you for your patience and understanding.
Thanks for the heads up! Hopefully this bug resolved quickly! 
The bug was fixed, and this resumed being rewarded immediately about two hours ago.
Thanks for the communication, Kaivax.
I just got the achievement through Dragonflight Keystone Master: Season Two, but didn’t receive the item Draconic Mark of Mastery. Have tried relogging, didn’t help.
Hi, there’s a new bug where people can lose score after a key.
Gives you a step ladder to stand on . there you go 
. Now he might hear you .
My group also received the achievement + mount, but were not rewarded with the Draconic mark of mastery. pls send help.
Achieved Dragonflight Keystone Master: Season Two but no Draconic Mark of Mastery after the “fix”.
My group also experienced this issue earlier today
Also completed Keystone achievement now and did not receive the token.
give token pls
It would be good to hear whether this was intentional or is a bug.
Still have not received my mark of mastery after achieving 2k m+ score
got the achievement and mount, but no mark of mastery
Just got 2k score, didnt get draconic mark of mastery
Also experiencing this problem.
I’m about 99% sure this is just an 1 time phenomena of the timer adjustments to UR, FH, and Uldaman that went live recently, and M+ scores not being re-calculated until the person finishes a key.
It should be safe to earn the achievement now and collect your reward. Anyone who’s earned the achievement prior to this fix will earn their reward early next week.
This is a bit of a kick in the teeth to people who earned the achievement while it was bugged, if we aren’t going to get the token until after the reset, especially since a lot of people sought out this token specifically for progression raiding