Problem:

Office 2016 application keep saying license not active, and when you have reactivate it still appear as not active.

Solution 1:

Step 1:

Uninstall the current installed Office Application.

Step 2:

Download new installation file from Office 365 and install.

Solution 2:

Step 1:

Open Command prompt in elevated mode (Run As Administrator). Then change directory to following below.

1. If the office 2013 installed is 32 bit use following folder:
C:\Program Files (x86)\Microsoft Office\Office15
2. If the office 2013 installed is 64 bit use the following folder:
C:\Program Files\Microsoft Office\Office15
3. If the office 2016 installed is 32 bit use following folder:
C:\Program Files (x86)\Microsoft Office\Office16
4. If the office 2016 installed is 64 bit use the following folder:
C:\Program Files\Microsoft Office\Office16

Step 2:

Display the current installed license. They in the following command.
cscript ospp.vbs /dstatus

Step 3:

Remove all the office license installed. Run the command bellow untill all the license is remove.
cscript ospp.vbs /unpkey:<5 Digit Key>

Step 4:

Reboot the computer.

Step 5:

Reactivate Office 365 Application, I prefer to use Excel. Open blank Workbook, then click File -> Account, then Click Activate Product. Then provide the office 365 account to activate.