Why can't a minor see the Yukon code?

I haven't applied before or the application is different, so I can't see it.

If you have applied for a health code for your child before, it will not be lost. You can find a platform to apply for health codes for children at that time, such as Alipay. Click on the "health code" to see if there is a child's health code in it. Even if the health code handled at that time has expired, parents can re-apply for their children. It is not troublesome to apply for a health code at present.