https://www.bleepingcomputer.com/news/google/google-voice-silenced-by-expired-tls-certificate-in-february-outage/ > In an incident report published on Friday, Google said that a Google Voice outage affecting a majority of the telephone service's users earlier this month was caused by expired TLS certificates. > This worldwide outage prevented most Google Voice users from logging into their accounts and using the service for more than four hours between February 15th and February 16th, 2021.