Same here but I read get from play store MaAppsharer to grab from a device where it's working and install it on tablets and phones....works fine on Note 4 and Note Tab 4. I had already traded in my Note 3 (had no issues) ....I resurrected my GNEX and uploaded the apk to Dropbox and installed it on my N4 and NT4....the issue was to be able to obtain the installer....every site I looked at to just download the apk was full of risk.
Others have knocked it's not as robust as other office apps out there, but all I needed to do is share the cloud storage and veiw docs....BTW, if you have the 365 subscription, you now have 10tbs of cloud space
How To Install Microsoft Office Mobile on Unsupported Android Tablets
The apk is free so if anyone needs it message me I'll get the zipped file to you, Cyn