In my case 2019 1098t has box 1 is blank because the university billed in December 2018 but got payment if January 2019. If you use the box 5 minus box 1 the entire scholarship is taxable. When I went into forms mode there was a section for box 1 adjustments where I entered the payment received amount which took care of the tax issue. It seems if the billing was done in 2018 (December) it does not generate information for Box 1 and was told that this was an IRS change to the schools (revenue recognition, etc). I have not confirmed if is this is the correct way so reaching out for verification. My documentation is from the  actual invoice.