After you file

I have a similar situation I need help with. If someone used to be a dependent but was no longer eligible for 2019 but the their name was put down as a dependent with the box left unchecked to qualify them for any credit on someone's return. No credit was received for that dependent either because the box was left unchecked beside the dependent name. But their name was apparently saved from previous years and the tax pro knew they wasn't no longer a dependent but yet  left the name on the form but didn't check the box. Not being aware of the issue and assumed since no credit was giving for the dependent it was done correctly. But looking on tax forms the dependent name was left under dependents with box unchecked to qualify for credit. So how do you file an amend to remove the dependent names when no credit was giving for the dependent? One would think since no credit was received that the person wasn't considered claimed as a dependent and I was told that by several people. But that has to be the reason they didn't receive a stimulus check. They get SSI only don't file taxes. Are they still considered a dependent when box isn't checked and no credit giving? If so how do you file an amend to remove them cause they are no longer a dependent.Any help would be greatly appreciated