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: ucrtbase.dll
Exception code: 0xc0000409
Path: C:\Program Files\WindowsApps\MSTeams_25275.2601.4002.2815_x64__8wekyb3d8bbwe\ms-teams.exe

Tried: cleared Teams/WebView2/AAD caches, reinstalled Teams + WebView2 + VC++, did Reset this PC and clean USB install — same result.

Works fine for local admin + other Entra users and browser.
Older builds (Aug/Sep 2025) work fine → likely regression in this release.

Please confirm if known and being investigated.