The provider we work with for Two Factor Authentication, Twilio, is currently experiencing issues when sending SMS for 2FA. They are currently troubleshooting the issue.
'We are continuing to experience connection issues across multiple products such as Programmable Voice, Programmable SMS, Billing, Messaging API, Conversations API, Flex, Chat, Conversation, Super SIM, Verify API, Authy API, Console, Autopilot, REST API, Identity, Studio API, Phone Number API, Pricing API. Our engineers are working on finding a solution. Twilio Console access is being restored. Our ability to process voice calls is unaffected but auxiliary services may be operating in a degraded mode. We expect to provide another update in 1 hour or as soon as more information becomes available.'