How will get my 28 recovery key

Hello ~ Have you set up the recovery key and forgotten it? Take a look here….

How to generate a recovery key - Apple Support*

*Using a recovery key is more secure, but it means that you’re responsible for maintaining access to your trusted devices and your recovery key. If you lose both of these items, you could be locked out of your account permanently. With that in mind, it's important to keep your recovery key in a safe place. You might want to give a copy of your recovery key to a family member, or keep copies in more than one place. That way you always have your recovery key when you need it.

~Katana-San~

You can generate a recovery key on any of your trusted devices as described here:

How to generate a recovery key - Apple Support

However, it DOES entail some risk; as doing so inhibits Apple’s account recovery service; meaning you are assuming TOTAL responsibility for maintaining your account access.

For a user who thinks that he might have problems keeping track of his AppleID, Password, and Trusted Numbers … perhaps keeping track of yet an additional piece of info is not the best plan.