This is a frequent problem. I'm sorry for the complication. Please see this TurboTax FAQ: https://ttlc.intuit.com/questions/1899162-what-if-somebody-already-claimed-my-dependent
Have you followed the steps here: https://ttlc.intuit.com/questions/4667226-how-do-i-amend-my-2018-turbotax-online-return ?
You'll need to print the amendment also.
Please reply if you have any other questions.
