You probably already got the 1,400 3rd Stimulus payment last year in March - May. Double check your bank account. So you don't get it again on your tax return. Check line 30 to see if you tried to claim it again. You can't get it twice.
Did you get a letter 6475 saying the IRS sent it to you?
If the IRS thinks they sent it to you but you didn't get it request a trace for a missing third Stimulus payment
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...
