I don't recall any requirement on new voters, but maybe there is? Only his was rejected, other two adults mine/wife were accepted.
Thankfully there is an email option to send in verification proof. Assuming someone checks the inbox and validates them.
Still odd that it's requirement was only by 16th to prove, so if they have enough votes, nobody will care, if it's a close call count, we might not know the outcome until after November 16th.