Hi…,
Welcome,
Make sure your Windows time is synced to local time.
Delete contents of WASM folder, likely something like
For regular MSFS Store Version:
%LOCALAPPDATA%\Packages\Microsoft.Limitless_8wekyb3d8bbwe\LocalState\WASm\MSFS2024
For the Steam version:
%APPDATA%\Microsoft Flight Simulator 2024\WASM\
See also SimBrief no longer in EFB in MSFS 2024 - #2 by Ian
Cheers
Ian