Hi amaderby,
Thanks for your post and welcome to the forums. It's great having you on board with us in the Community.
I'm sorry to hear that you've not been able to see a resolution for this publicly. Usually, our postcode checker works off the Royal Mail database. If your address is a new address that has only recently been updated then we may need to manually update our database with our House Files team.
We take people in to private message to get their details and then we can go from there 🙂
I can see Joe spoke with you via private message, can you confirm if things are resolved now? if not pop back and let us know so we can help further.
Thanks,