How to Restore Missing SMS Two-Factor Authentication Codes
Many websites, from Adobe to Zendesk, let you receive two-factor authentication codes via SMS text messages. That's good---any form of two-factor authentication is better than none---but you're often effectively locked out of your accounts if those text messages don't arrive. A simple fix is to call your cellular carrier and ask to have any blocks removed from your account. Automated scam and fraud prevention systems may have installed those blocks---it wasn't necessarily related to anything you did---and the carrier can remove them easily.