Hey there, Gabewest.
The availability to add a person who lives outside the United States is currently unavailable. The best thing to do is to file it manually with the IRS. Doing this also ensures that you'll be filing the accurate form.
In case you want to learn more about 1099, you can refer to this material: Get answers to your 1099 questions.
Please keep me posted if you have further information or concerns related to QuickBooks. We'll be around to help.
