If Status Code is 4xx
Try to change it to 200 OK and see if it bypass restrictions
Check the response of the 2FA Code Triggering Request to see if the code is leaked.
Rare but some JS Files may contain info about the 2FA Code, worth giving a shot
Same code can be reused
Possible to brute-force any length 2FA Code
Code for any user acc can be used to bypass the 2FA
No CSRF Protection on disabling 2FA, also there is no auth confirmation
2FA gets disabled on password change/email change
Bypassing 2FA by abusing the Backup code feature
Use the above mentioned techniques to bypass Backup Code to remove/reset 2FA restrictions
Iframing the 2FA Disabling page and social engineering victim to disable the 2FA
If the session is already hijacked and there is a session timeout vuln
Enter the code 000000 or null to bypass 2FA protection.