Thanks for this comment. I had a similar problem with email verification assuming particular email formats. I really appreciate your pointing this out, I would not have found it on my own.

I removed the "house number" section in favour of on the "recipient address" section, and your comment makes me think it might be better to simply have text fields for Name / address / city / province / postal code rather than fields that are more complicated, because unless they are executed very well they might end up being barriers.