about 5 years ago - WotC_Lexie - Direct link

We know, we're investigating. Updates are on the News & Announcements page.

Also:

We have temporarily disabled the #MTGEldraine Mastery system to address issues with Quest and Weekly Wins. Players will also be unable to earn Weekly Win and Quest rewards at this time.

The Mastery system should be re-enabled at approximately 10:30 a.m. PT. We'll update you with more information once it becomes available.