(Edited per @TomD8 's reply):
Unemployment compensation (UIC), is taxable by the state you lived in when you received the income. So, the OR UIC is taxable by OK.
OR, unlike most states, apparently also taxes UIC paid to non residents, so it should have been reported on the OR return. But, you claim a credit on your OK state return for the tax paid to OR on the UIC.
