On 2025-01-06 at 12:34 UTC, users of the Groove WebApp, Extension, Dialer, and Outlook Add-In experienced login issues due to an expired SSL certificate. The expiration occurred during the holidays and was missed in our standard notification processes. By 01:35 UTC, the engineering team resolved the issue, and users are advised to perform a hard refresh on their browser to ensure normal functionality. No customer data was compromised during this incident. We recognize that this issue was preventable and have implemented stricter site validation measures to ensure similar incidents do not happen in the future.