If you are not getting the confirmation text message after entering the number, means you there is something going on why that text message is not reaching your phone.
Check the following:
1. When you optin, please make sure you select the correct country in regard to your phone.
2. Make sure you enter the correct number
3. Make sure you can receive text messages on your phone.
If you have done this correctly and do not get a message, the next step is to try it out with a different phone.
You could use a friend or family members phone if possible.
If that fails, there could be a temporary network issue with Facebook, in which case you could just wait a few minutes and try again.
Please contact support, include link to where the page is located, along with your wordpress login details.
We will run a test text message and see if it works for us.