Can't move datadir on MySQL for Windows

[Daniel Reeder]

I have an install of MySQL 5.7.18 on Windows Server 2016. The default installation settings set the data directory to "C:\ProgramData\...", which is filling up. I would like to change the directory to another drive (i.e. E:\Data), but the server refuses to recognize my changes, and continues to look for a directory on the C:\ drive. Does anyone know how to fix this?

So far I have tried:
1.Changing the my.ini file + restarting the server
2.Using xcopy on the old directory to copy into a new location + updating my.ini + restarting