Husband was a full time student all of 2022 and received 1098-T but TT saying he is not eligible for the credits?

We are family of 4. I am the only member working and husband is a full time student. We have 2 dependents and he received his 1098-T we entered it into TT and after entering all other information in this section it says he is not eligible for a tax break? We are not sure why. We file married jointly.