1. Open a PowerShell (or command prompt) as Administrator

2. In the PowerShell (or command prompt), type the following:

• Office 2019/16 (32-bit) on a 32-bit version of Windows
  cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /dstatus

• Office 2019/16 (32-bit) on a 64-bit version of Windows
  cscript "C:\Program Files (x86)\Microsoft Office\Office16\OSPP.VBS" /dstatus

• Office 2019/16 (64-bit) on a 64-bit version of Windows
  cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /dstatus

3. You should now get a screen with some license details such as the license name, type and the last 5 characters of the Product Key.

4. You can use the last 5 characters of the Product Key to remove it using command:

• Office 2019/16 (32-bit) on a 32-bit version of Windows
  cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /unpkey:<LAST 5 CHARACTERS>

• Office 2019/16 (32-bit) on a 64-bit version of Windows
  cscript "C:\Program Files (x86)\Microsoft Office\Office16\OSPP.VBS" /unpkey:<LAST 5 CHARACTERS>

• Office 2019/16 (64-bit) on a 64-bit version of Windows
  cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /unpkey:<LAST 5 CHARACTERS>

5. Cheers! — Src.