I think it is clear about who should claim the dependents based on the court order or other arrangement made by both parents. However, you are trying to figure how and if you can amend electronically.
If one parent has filed and claimed the dependent and now wants to amend that return to remove the dependent, that could hinder you from e-filing. You should not even attempt to e-file with the dependent because it will most likely reject because of the dependent Social Security Number.
I suggest claiming the dependent on your return and print and mail the return with a letter of explanation to the IRS. They will then be able to process your return manually, if the spouse has amended to remove the child.
On another note, the IRS is not accepting amended returns until late February. TurboTax allows you to amend free.
@Bonusmomma
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