How to use one iOS device for multiple 2FA Apple ID accounts
imore.com - 02-14
As of February 27, 2019, Apple requires developer accounts to enable two-factor authentication. In an effort to keep your account more secure, two-factor authentication will be required to sign in to your Apple Developer account and Certificates, Identifiers & Profiles starting February 27, 2019. This extra layer of security for your Apple ID helps ensure that you're the only person who can access your account.