What do I do if none of my subcontractors received their 1099s that were supposed to be mailed through your service.

Thanks for bringing this issue with us, crunge.

I'll share details regarding when your subcontractors receive their 1099s.

E-filing your 1099s before January 28 at 5:00 PM PT ensures they are postmarked to your subcontractors to the addresses indicated in their profile by January 31. 

You can give your subcontractors the ability to see their 1099 forms online. For more information, refer to this article: Fill out a W-9 and View Your 1099-MISC in QuickBooks Self-Employed.

Don't hesitate to post again if you have further questions about tracking the 1099 emails or other concerns. I'll be glad to assist.