When you filed your original return, did you also file Form 8379, Injured Spouse Allocation? If not, you will need to do this as soon as possible to ensure the IRS is aware. This will allow the injured spouse to receive their share of the refund. Please see this link for guidance on preparing Form 8379.
Please see this link from the Taxpayer Advocate as well. It provides some useful tips to help you and can be used as a resource to bridge the gap between you and the IRS if needed.
What is IRS Form 8379: Injured Spouse Allocation
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