How do I update my phone number for automated calls?

I have NIS v. 22.5.2.15 installed on several machines and periodically it will require me to re-login to my Norton Account before allowing me into my Identity Safe Vault.  When I do, I get an automatic phone call with a verification code to my home phone.  How do I go about changing the phone number that gets called?  I scoured my Norton Account and the only entry for a phone number under "Personal Information" is currently blank so I don't think that is the issue.  Thank you!