I am having the same issue.  I have the date 12/31/20 entered, but the rejects seems to have something to do with the input of "various" for the country.  It is foreign tax paid on mutual funds often paid to several countries.  The taxpayer even called their investment advisor at Vanguard who said there is no way they will trace all the countries some of these funds are paying taxes to.  I am hoping an update will fix this.