There must be - that location was for steam installs - for MS Store installs it should be under:
AppData\Local\Packages\Microsoft.Limitless_8wekyb3d8bbwe\LocalState\WASM\MSFS2020\fsuipc-lvarmodule\work
In fact, your screenshots show you have one in that location. Screenshot (2077).png shows the log file for MSFS2024. and Screenshot (2076).png shows the log files for both 2020 and 2024.
There won't be an FSUIPC_WASM.ini file there by default - you have to copy this across from the Community folder. See the section WASM module ini file and parameters on page 51 of the Advanced User guide for details on file locations.
You can also set Debug level logging there. Note that that file gets overwritten when you re-install/update, which is why it is better to change the one under your AppData folder, which also takes precedence (when provided).
Ok, then no need to send/show me the WASM log file then. Keep Debug level logging activated, and the next time they don't start show me the WASM log file.
John