If the phone number used is different from the IP of the account, then your code won't be sent to you.
Example. The IP of the account is in the US and the phone number that you are using is from Singapore.
Many of free free 'voip' numbers are banned or blacklisted.
They've been abused so Google and other popular sites just shadow ban them - meaning they won't tell you the number isn't accepted, they'll just not send the confirmation.
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