I am also having the same problem. I acquired a business email to link to my account and have tried several times to have it changed, but to no avail. Nothing in my inbox nor my junk.
Thanks for your time.
Please, check the settings for your email provider and make sure emails from Upwork aren't being blocked. If that doesn't solve the issue, could you please send me a private message with the email address you are trying to add?
I checked my account and nothing is blocked. I tried to email you directly, but received this message:
"You do not have sufficient privileges for this resource or its parent to perform this action."
Despite being signed in.
Sorry for the trouble,