You should mail the SS-8 now separately and e-file your return.
The SS-8 gets filed by mail, separate from your return. From the IRS:
Send the completed and signed Form SS-8 to:
Internal Revenue Service
Form SS-8 Determinations
P.O. Box 630
Stop 631
Holtsville, NY 11742-0630
Faxed, photocopied, or electronic versions of Form SS-8 are not acceptable for the initial request for the Form SS-8 determination.
Do not submit Form SS-8 with your tax return as that will delay processing time.
More information here: SS-8
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