Can I get 2nd EU residence to work in EU country (other than Portugal) having a short residence in Portugal under PGV program?

The specific case that the lawyer gave us sounded like this: a child from a family participating in the PGV entered a university in Austria. And Austria did not give him a study visa due to the presence of a short investment resident card in Portugal. As I’ve understood the child had to be excluded from the PGV program. And this can happen to an adult due to necessity of work in another EU country