From the Diagnostics:

Taxpayer's name is being truncated in the e-file. As a result of truncation, the IRS will reject the return. Shorten the taxpayer's or spouse's name using the following priority: a. Omit titles such as M. D. or Ph. D. which are not part of the taxpayer's given name. b. Input middle initial instead of keying the entire middle name. c. Omit the spouse's middle initial. d. Omit the taxpayer's middle initial. e. Substitute initial for spouse's given name. f. Substitute initial for taxpayer's given name.