In one line
A short code a creator places on their account to show they control it.
Influcius gives a creator a code for each account they add. Put in the Instagram bio or YouTube channel description, it proves the account is theirs.
No real check ever needs a password or a one-time code sent to you. Anyone who asks for one is not checking an account: they are taking it.
Agree: use only the steps shown inside Influcius.