D4 - Cant Launch - Failed to create global mutex. Error:1314

Every time I try to launch Diablo 4, I get an error

“Failed to create global mutex. Error:1314” with choices “Exit” “Debug” “Ignore”

Exit and Ignore just close the window / does nothing.

Debug brings me to a “Fenris” window - with an “The application encountered an unexpected error.”

“Please use the report ID below when communicating with Blizzard about this issue. 38DF5AE1-1850-4FAB-816B-03E8485CE6D3”

A simple search…
https://www.google.co.uk/search?q=diablo+iv+forums

The very first link returned…

Alternatively…

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