How can I get my recovery key?

BTW, I tried to call Apple Care and they told me that my iPad is no longer supported :-)

It's the original iPad. It's only 7-years old. Very disappointed by Apple on this!

There is no Replace Lost Key option.

I'm trying to log in my old iPad and asking for RK-

What is the recovery key and how I can get it

The Replace Lost Key button is not there.

Contact Support and see if they can send you a replacement