Apple Store dispatch email address different to my Apple ID address

Hi all, every time I make a purchase from Apple (not that I make that many) the dispatch notification email address is different to my normal ID address (I suspect it’s what I set up as my back-up email)

I have searched everywhere, gone into all the settings I can think of but can’t find a way to change it. It’s not a major problem at the moment, but it’s a business address which I may close down in the future.

Any suggestions would be gratefully received.