Each time I e-file I get rejected, stating R0000-507-01. My ex amended weeks ago to get fixed, but I'm still rejected. We both used TurboTax. What can I do to efile?

[JamesG1]

Reject code R0000-507-01 means that a dependent that you claimed was claimed on another return.  That is why the other parent is amending their incorrect tax return.

An amended tax return is a paper filed tax return and will take 4-6 weeks before it is completed.  That return can be tracked at the IRS website under Where's My Amended Return?

There is no good option. 

You can paper file your original tax return which will take 3-4 weeks if the other parent amended tax return is processed on a timely basis.

Or you can wait until you have confirmation that the amended tax return has been processed and then electronically file your tax return.

[Davidoc]

We also get this error.  No one else can claim the dependents. We checked with the Social Security Administration and they said our SS numbers are correct and match the dependents name.  The IRS is closed during the pandemic.  Someone must have used one of the dependents SSN, maybe by accident.  What shall we do?

[fanfare]

When a return not your own improperly uses your SSN or your dependent's SSN, 

you can't e-File.

You must file a paper return via US Mail.

Then you wait for the IRS to figure it out.