I filed return last year jointly with my husband but as I look at it now it doesn’t show any of his income was used on the return. Could there be an error? What do we do?

Always print a copy of your completed tax return for your records, and review it carefully before e-Filing.
You will need it if you are audited by the IRS, or to amend if a TurboTax update changes your return or for any other reason.
AND, to find your AGI next year.
OR, to verify income is assigned to the correct person.
OR, to observe that your reported income is way too low.

If you filed an incorrect return last year, the remedy is to file an amended return, correcting the error.

How do I amend my 2019 TurboTax Online return? (intuit.com)