The staggeringly-idiotic company Brother (printers) won't let you update your email (which is your account name), but also won't let you register the same printer on a new account (with the new email)
Your account is defined by your email address
Your email address is unchangeable
You can create a new account with a new email address, but you can't re-register the same printer, because it was already registered to your old email address
This means you can be locked out of registering your printer. Why are all printer companies the stupidest companies ever?
Buy a cheap laser and throw it in your closet and only pull it out the few times you need to print, and it will always just work no matter what you plug it into.
There's zero reason to register, and even less to try and update that later.
I'm still bitter my old brother printer tried to force me to buy ink. Had to put black tape over the sensors. It seems they don't do that anymore, thankfully.
We have an older Brother printer, and they now insist, even though there's a USB port, that you register with them to print over wifi. There is no driver for USB that I could find. There is an app that will let you print over USB, but it's buggy and very limited in function.