https://bugs.winehq.org/show_bug.cgi?id=43783
--- Comment #4 from Rosanne DiMesio dimesio@earthlink.net --- I don't know if the riched20 override is the cause of your specific problem, but we have had other users unable to activate with the override set who were able to activate when they removed it. It's easy enough to test.
Is your version of Office volume licensed? If so this could be a duplicate of bug 30033.