MPs, East Alerts 2NT by tapping on the table.
The play by south is kinda bad, ♣K lead, club to the ♣A, diamond back and declarer thinks but plays low to ♦Q, ♣Q, East pitchig a diamond, diamond ruff, heart, and declarer manages to misscount trumps and lose another diamond ruff for down 3.
North asks south why did you make that diamond finesse, don't you know what 2NT is?
Yes south says, 20-21.
No he alerted.
I didn't see any alert.
So north calls director and says that one of the reasons why South made the diamond finesse is that East didn't alert properly the 2NT bid.
South is a beginner, north argues that counting to 40 is beyond his current level.