It was discovered that some accounts were not set to the default IP/email authentication security feature. If you were not required to authorize a new IP at login in the past, your account was recently updated with this requirement. Please know that you can authorize an IP/network so that you will not be required to verify the same IP with each login. More information concerning IP/email authentication can be found here.
Please note: This security setting requires you to verify and approve, via email, any new IPs attempting to access your account. This is an account security setting that cannot be removed. If you’d like to look into using a different authentication method, please visit this article which provides details about SMS authentication and other authentication apps.