I created an IG account yesterday and today I tried changing the username and the action is blocked. Have anyone ever face this problem and how long does it take for this action to get unblocked?
Yes, you should warm the account up for a few days before trying to change the username.
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Did you create it from your PC/mobile?
In any case trito change the username from you PC/mobile and not from Jarvee 
When you changed your username, it made your accounts log-in again, I think this is the reason, so just stop 24h and warm up again!
Good Luck!