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There are no SMS credits remaining
SMS messaging is disabled
SMS messaging is not setup
No mobile phone number is entered
If you’re unsure about why a code isn’t received by the user, check the messages they should have received, to understand more about where exactly it was sent, and if there is any more information about what’s happened to the message (eg. if it’s been rejected by the email account, or the phone number was wrong, etc)
More information on multi-factor authentication is available here; https://en.wikipedia.org/wiki/Multi-factor_authentication
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