We are seeing our SMS provider block a high percentage of SMS messages to certain foreign countries, especially Philippines, Mexico, and Pakistan. We'd advise using an alternate MFA method (e.g authenticator app) vs SMS if you have a non-US phone number (https://help.gethealthie.com/article/1372-multi-factor-authentication). If that is not possible, our support engineering team can allow-list any current numbers if you reach out to us.