Which State Return to Enter Americorps Segal Education Award

My son earned an Americorps Segal Education Award while working for 2 years in Oregon for a non-profit organization.  After the job ended in 2022, he returned to California which is his domicile and used the Award toward qualified educational expenses of graduate school.   He is filing both California and Oregon tax returns. Which return should he use to report the award?  The 1099 MISC that documents the award is addressed to his California domicile, and it is a California University's expenses toward which he is applying the award, so shouldn't he report it on his California tax return?