You will have to file by mail if you can't get it and are filing Married Filing Separately. You won't be able to e-file without her info. If you have a dependent child living in the home that you provide upkeep for, and you were separated for the last 6 months of 2021, you may be able to claim Head of Household status and in that case, you do not need her SSN to e-file.
How can a married person file Head of Household?
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