My foreign national without SSN and I live in Brazil under the Foreign Service. How do I file?

Hello,

 

I recently married a Spanish citizen who lives with me in Brazil while I serve as a Foreign Service Officer.  I felt "boxed in" when filing taxes because when I tried to mark my husband as my dependent, I was required to provide a SSN for him.  However, he doesn't have a U.S. income because he teleworks for a Spanish company while we are in Brazil so all his tax information is in Spain.  I *had* to file as single, otherwise, the form was deemed incomplete and ineligible to submit.  What should I do the next tax cycle?