Problems encountered when turning on two-factor verification in the Developer Center:
Solution:
Click the support page to enter the details to see the entire step;
Chinese version:
https://support.apple.com/zh-cn/HT207198
001
如果未开启双重验证，那么开启；
如果已经开启，则可以关闭，再重启。
002
Use your mobile phone to log in to appid; then set-appid-security and password; click to turn on two-step verification-update account security
When you log in to the Developer Center in this way, if you have logged in to the phone corresponding to the appid, you will be prompted:
Click Allow and it's OK.