Education

My son finished his Masters last spring, and is now a PhD candidate.  As a PhD candidate, his tuition is fully covered.  He received his 1098-t from the school for his Master’s program, but did NOT receive a 1098-t from the PhD program since everything was covered. Since he doesn’t have the 2nd 1098-t, should he say he attended 1 or 2 institutions?  He doesn’t have the taxID info, etc for the 2nd school.  He would also have to say he did not receive a 1098-t as there was nothing paid.  What’s the correct way to handle this?