Can't access email app, because I am prompted to enter another phone number

Can't access email app, because I am prompted to enter another phone number

I have already saved a phone number in my account, and verified it, but whenever I try to access the email app, I am prompted to enter a phone number.  And when I enter my phone number, it tells me I'm already using that phone number.  As a result, there is no way to access the email app without entering a second phone number.