msg.exe not working as some users have no sessionname

[Pip]

As the title says.
msg user "string" works if that user is the current console but it is not working when to users with no sessionname.
Even msg * "string" does not work only sending to the user logged in with console.

I was hoping to create a "time for dinner" type of alert to all active users via HomeAssistant and Google Home with this being my stumbling block.

Anyone have any thoughts on this?