Can't add Solo v2 Security Key (MFA)

I am trying to add a physical security key to my account but fail to do so. Here's my process:

Browser: Brave, current version, Adblock disabled

  1. Click 'Add physical security key' in my account settings
  2. Enter name Solo v2 and click Register
  3. Browser alert pops up, telling me to touch the key
  4. Touching the key doesn't do anything, prompt remains until manually closed.
  5. Error message in forum popover: The security key registration process either timed out or was cancelled.
  • The key works flawlessly for other websites that use the WebAuthn framework (register & login).
  • The browser console doesn't show any errors.

What am I missing here?