@Al816 Your assumptions are correct. Enter the amount paid to Maryland and do not enter anything for DC since the DC amount paid has already been credited on the DC state return.
If you have or will pay for the TurboTax account before e-filing make sure both your federal and both state tax returns are correct by viewing the returns or printing them out.
Click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return.
