I use CMDNOWND for this. https://dennisbabkin.com/cmdnownd/

You pop it in the cmd line like this: cmdnownd "D:\Libraries\Documents\batchfile.bat" and it suppresses the appearance of the cmd window. Just place the exe in your path. I keep it in the Windows folder itself.
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@Russ Thanks!

@Yoni, thanks for letting me know. I'll make it case-insensitive in the next version.

@David-Coulson, I fixed it. Now you won't get these "TRIGGERcmd - Your command didn't run" emails if the sender is Home Assistant.

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Thanks again for reporting the problem.