@Daniel ********
you can try it again no issues, I had to apply 3 times (getting rejected each time) before finally the 4th time i got the address exactly as they had it in their system
Make sure you get the address exact (and it has to be the same address you applied for the extension with and the one that has the TM30 filed)
I'd apply again, see if it gets rejected. Sounds like you're doing everything right. (as long as you haven't left/returned to the country during the time you got the extension and 90 day report notice paper and now).
Keep in mind you have up to 7 days AFTER the actual due date to file a report in person so if you have a due date of the 7th you have until the 14th to go in person and apply (actually friday the 13th as the 14th is Saturday ๐ )
Try online again, see what happens