Apple Login Failed on Android Phone

I couldn’t log in to Apple on my Android phone. This is what happened (Brave browser):

  1. Entered user name and password
  2. Security key requested and I plugged it in
  3. It asked me to set a PIN for the key, and I did
  4. It requested the PIN and I entered it
  5. The key started blinking in the normal way
  6. I pressed the button on the key and it immediately started blinking rapidly
  7. It returned me to step 2

Any idea why this didn’t work?