This isn't a ProSeries user question. It's a bit beyond this.
"Can they apply for ITIN?"
It isn't clear which party is "they" for the issue."Individuals in F-2, H-4, TD or O-3 status will not be issued Social Security numbers." TN means they get SSN and TD means they get ITIN, as I understand it, but you need to do the specific research yourself. It isn't clear if the issue relates to working?
https://www.irs.gov/help/ita/am-i-eligible-to-apply-for-an-individual-taxpayer-identification-number
https://www.irs.gov/individuals/international-taxpayers/taxpayer-identification-numbers-tin
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