Why won’t iPad accept my new recovery person

See this article:

Set up an account recovery contact - Apple Support

It might be as simple as your desired individual not having sufficiently modern Apple devices to serve as your Recovery Contact.

4anital Said:

"Won’t accept my new recovery person ?"

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If you mean "Recovery Contact"...

What happens when you click: "Choose someone else."?

4anital Said:

"Won’t accept my new recovery person ?"

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Removing an iPad from a Backup:

On an iPad, you can only recover to a backup that is of the same iPadOS.

Please Clarify your Post:

What role does the word "person" play in this?

I suspect he means that he’s unable to designate an “Account Recovery Contact”