Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hey,
I dont know if you have solved the problem, but I got exactly the same error after the exactly the same sign in problem for a month now.
After so long I actually solved it yesterday so this might help you too.
Make sure you have the latest Windows Update installed.
I had the Windows 10 version 1803 and the latest is 1809. ( I am sure you are not stupid so you know how to check in, but to look that up: right click on start button and click on System )
After installing the update you need to restart your PC and you can start to install the MS Office.
At least that was my case and it helped.
One last thing, you dont need to uninstall all the office products to make it work.
I think this error is that you have old version of Windows that does not support some new Office updates.
Cheers,
Daniel