Great Vault not recognizing progress

So I just finished my very first Mythic run in Shadowlands and had a quest to claim a reward from the Great Vault. But when I go to collect my reward for finishing one mythic dungeon…the system does not acknowledge the fat that I just did a mythic run despite the weekly event tracker to complete mythics this weekend shows me at 1 of 4 mythic runs completed.

This needs to be addressed so I can finish this particular quest.