If you are unable to reach the "Payer" and do not have a 1099-MISC from the same payer from an earlier year, try entering 99-999999 as the FEIN. Alternatively, just add enough '0" s to what was reported in order to have nine (9) numbers in the FEIN field.
This is not ideal, but you will have met the requirement to report all your income. Your tax calculation will be correct.
In the unlikely chance that the IRS contacts you for further information, just explain that the 1099-MISC was incomplete and you reported the information you had been sent.
