Adding email to current account from account I cancelled - not working

Hello,

I am no longer going to be able to use the email address I started my unpaid Box account with. I initially couldn't figure out how to transfer ownership of my files to my new email address. So I created a new Box account with my new email address, but then later realized I could have just added my new email address to my existing account and made it the default email address. However, when I tried to do that, it said I cannot because there is already a Box account associated with my new email address. SO, I cancelled the Box account associated with my new email address. Then came back to my original acount and tried to add my new email address to it by selecting "link personal email" in my account settings. However, it keeps giving me an error message telling me "Oops - that person already has a Box account." Except I have cancelled that Box account...

Why am I receiving this error message when I no longer have a separate Box account under that new email address? I just need a quick way to make my new email address the owner of all the files I own on Box so I can delete my current email since I will no longer be able to use my current email in a few days.