Hi Victor - thanks for that - except that you are not correct - but you were close enough!!
I thought I had tried your suggestion and failed - but tried it again - and failed again.
Tried double double quotes - no good.

Tried triple double quotes - and it worked!!

Other than %t being empty, I got the whole message in %m .
This works:
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe c:\scripts\create-inc-from-alarm.ps1 -device "%n" -sev "%s" -tyme """%t""" -pd "%(pass)" -msg """%m"""
The only two questions that remain are a follows:
1. Is time Alarm Created available? - %t is empty
2. Can I get the Event message? I would like this so I can create the ticket with Event Message which I create as a summary of the alarm.
I thought I had tried your suggestion and failed - but tried it again - and failed again.

Tried double double quotes - no good.

Tried triple double quotes - and it worked!!

Other than %t being empty, I got the whole message in %m .
This works:
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe c:\scripts\create-inc-from-alarm.ps1 -device "%n" -sev "%s" -tyme """%t""" -pd "%(pass)" -msg """%m"""
The only two questions that remain are a follows:
1. Is time Alarm Created available? - %t is empty
2. Can I get the Event message? I would like this so I can create the ticket with Event Message which I create as a summary of the alarm.