As I said yesterday, people who still have the problem need to find a way of getting to a Senior Engineer. I had this problem, when I first got my 8 Plus on release day. It took about 6 weeks for the IUP app to recognize my phone was enrolled. Apple was great about remaining in contact. I am not suggesting your issue will now take that amount of time. However, try and get to the right level of staff, who can resolve the issue. Be polite but persistent.
BTW, I fail to understand why people who want to remain in the IUP, have not checked their eligibility s few months before release, to allow sufficient time for resolution without stress.