My federal tax return was much less than what I was suppose to receive?

They sent the 3rd Stimulus payment (1400 per person) starting in March 2021. Double check your bank statements and check your IRS account (both accounts if married) to see what they sent you.
https://www.irs.gov/payments/your-online-account

If you didn't get the 3rd Stimulus check but the IRS shows they sent it to you then 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-payment-issued-but-lost-stolen-destroyed-or-not-received

You cannot get the credit on the return AND the advance stimulus payment ... so if you tried to get the credit on the return form 1040 line 30  but you already got the advance payment then the IRS removed the credit and recomputed the return. 

A reduction in your refund for the recovery rebate credit is most often caused by user error---when you were asked how much you received for the third stimulus check -- the one for $1400 per person sent out from March to May last year----did you enter the total amount correctly?   Did you use the amount from BOTH spouse's letters 6475?   Or did you say you did not receive the full amount and thereby put an amount on line 30 of your Form 1040?  If you received the full amount already then your line 30 should have been blank.   There should only be an amount on line 30 if you did NOT receive all of the 3rd stimulus.

Try checking your online account with the IRS

https://www.irs.gov/payments/your-online-account

Does the IRS show that you received a $1400 per person stimulus or EIP check in 2021?   Did you receive it?   When you were asked on your tax return did you say no?   Was there $1400  per person on line 30 of your tax return?

If the IRS says you got $1400 last year but you did not receive it you can have it traced.

LOST THIRD STIMULUS CHECK

https://www.irs.gov/newsroom/questions-and-answers-about-the-third-round-economic-impact-payment-top...

If you need to trace a payment that the IRS says has been issued to you, mail or fax a completed IRS Form 3911, Taxpayer Statement Regarding Refund.