Can’t add 2fa or remove email on facebook

Please try logging out of your Facebook account again. Then, disable the level 2 password and re-enable two-factor authentication (2FA)
 
It seems like you have enabled it repeatedly, which is why this error occurs. If you still cannot enter 2FA, change your network IP and change the authentication method when logging into FB using text messages.
 
I think you need to log out of the browser as that account then log back in and turn on 2-factor authentication again to see if it works
 
If you have just logged in to your device, you will need to wait a while to change 2fa or delete the email, as changes always cause FB to consider this as unusual activity.
 
This error often occurs when you use a new device to log in to Facebook. You should use an old device that has logged in to Facebook previously to confirm the new login location.
 
This happens when you log in on a new device, it takes about 2 weeks for the change to take effect, during that time interact regularly with this account on the new device
 
You will have to wait a while to change 2FA or delete email,This happens when you log in on a new device
 
a month or two and you'll be able to make changes but for security reasons, If you're having trouble adding two-factor authentication (2FA) or deleting your email on Facebook, you can choose to receive codes via text message or use an authenticator app.
 
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