I do not know if the security questions are "case sensitive" (like passwords). You might try variations.
Otherwise, the "last resort" is the famous "Factory Reset":
https://www.youtube.com/watch?v=cMw4ePACgc4
After this is done:
- The WiFi SSID/password are reset to the values printed on the product label
- The web management credentials are "admin" and "password"
- When you connect to the Orbi web interface, the setup will strongly encourage you to change the password.
After you get set up again, it is probably a good idea to save the "configuration" to your computer so the next time you can take the option, "Don't set up from scratch. I want to reload a previous configuration."
Good Luck
