Hi Michael,
Welcome to Box Community and glad to assist!
Please access the Box website through your browser and change your primary email address.
Hope it works!
I have the same issue via the Box website - I tried to change the primary default email. I added a new email and verified it. I also tried to make the new email primary/default, the error dialog is: “there is a problem updating your primary email.”
Is there a fix? With thanks, Mark.
