Facebook recovery code LS-NONCE

I used Facebook recovery code for my password but I keep getting LS-NONCE. But a friend tried theirs and gets a number. Now I’m getting a slow down message. I’ve never had this issue before.

Is it just doing that because I used it too much? It just started today the first request said it. I cleared browsers and restarted and tried again and same thing but didn’t know if anyone else has this.