'Unable to use runas with winword 2016

I'm trying to run winword (Office 2016) as another user from an administrator command prompt:

runas /user:[local administrator user] "C:\Program Files (x86)\Microsoft\root\Office16\winword.exe" Enter the password for [local administrator user]: [password]

but I get:

RUNAS ERROR: Unable to run - C:\Program Files (x86)\Microsoft Office\root\Office16\WINWORD.EXE 1312: A specified logon session does not exist. It may already have been terminated.

All suggestions are highly appreciated!

Kind regards

Birger



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