Recovery key

I have a 1st gen ipad that I just recharged. I'm trying to login with my apple id on it, and it's asking me for a recovery key. I don't recall ever getting one of these to begin with. I can successfully login with my apple id to my other devices, but there's no where in the security settings where I can reset my recovery key.

Does this mean that I cannot login with my apple id to my old 1st gen ipad anymore? This seems like a poor design on behalf of apple if we can't use our apple id's on older devices any more. I have searched this forum, and the only links were to a page with instructions on resetting the recovery key, which included options in the security section that are no longer available. Please let me know what other methods I can use to access this so that I can log into my 1st gen ipad using my apple id. Thank you.