What that means is the IRS told the Treasury Dept to send you the 1400. As far as they are concerned, it was paid. Double-check your bank account for 3/17/21 and forward to the end of the year. If you are absolutely sure you did not receive it, fill out form 3911 to have them trace the payment.
I guarantee you that I did NOT receive funds for the ‘stimulus’.
EVER.