You should go ahead and prepare your return showing your son as your dependent assuming he still qualifies as being a dependent.
If you get an electronic filing rejection code, go ahead and print the return and mail it in. The IRS may delay any refund while it attempts to verify who is entitled to the deduction.
In the meantime, you can also contact the IRS to report the suspected tax fraud. See the following link on instructions on how to report the questionable activity.
Reporting Tax fraud to the IRS
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