General DiscussionI am level 21 but why couldn't I play TBD games?

no ur not 21

your exp level is 21, not your profile level

The right answer is seppuku or harakiri.

I think you mean your trophy level that is lvl 21. (Experience trophy)
To play ranked games you need profile badge level 20.
AND, in order to get that you need level 50 experience trophy level (assuming you dont have any other trophy points like battle pass, etc.