You can either run a mythic dungeon or run a mythic+ dungeon using someone else's keystone. In either case, you'll get a keystone of your own at the end of the run. Then, if you do a m+, you'll get a keystone out of your weekly m+ cache at the beginning of the next week.
Please Help !
Thanks !
I didn't find the right solution from the internet.
References:
-https://us.battle.net/forums/en/wow/topic/20759297235
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