Teams build 25275.2601.4002.2815) instantly closes on launch ucrtbase.dll error 0xc0000409

After updating to Teams 25275.2601.4002.2815, the app opens for one second then closes—no UI, no error. Env: Win 11 Pro 23H2 (26100) WebView2 141.0.3537.92 Entra ID joined (AAD) Faulting module:...