My trusty Collins dictionary [Seventh Edition 2014] agrees with your conjugation of "riáis" for the 3rd person plural subjunctive but "WordReference [and Spanish dict] both give riais. There is a banner heading in the WordReference entry which I think translates as saying that the tilde was removed in the 2010 reform of the RAE.
Is your version a typo or am I missing something?
Yes, the accent used to be acceptable before 2010, but from 2010 the R.A.E (Real Academia Española) decided that it is not acceptable any more. I corrected the typo in the lesson.
Thanks Inma. John
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