The solution
A detailed solution was introduced in a recent article on the Microsoft website. Besides, if you usually follow the MSG community you may already know that there was a heated discussion on this issue. Active members have suggested various solutions for several days and finally we find the best one. I would like to extend my grateful thanks to DrVlaming, Vanchester90 and other ones for your kind support.
We had the answer though there are still a lot of people asking me to confirm the authenticity of the solution. That is why today I decide to put the solution on the MSG homepage instead of the MSG forum.
Method 1. Change KMS server
Step 1.1: Open the command prompt app on your Windows with admin rights.
open command prompt app with admin rights
Step 1.2: Change your KMS server address then reactivate your Office app.
Run the command below to go to the Office folder.
cd /d "%ProgramFiles%\Microsoft Office\Office16"
If you see the error “The system cannot find the path specified”, please try this one.
cd /d "%ProgramFiles(x86)%\Microsoft Office\Office16"
Run the following command to extend your Office KMS license.
cscript //nologo slmgr.vbs /ckms >nul&cscript //nologo slmgr.vbs /ckms >nul&cscript //nologo ospp.vbs /setprt:1688 >nul&cscript //nologo ospp.vbs /sethst:107.175.77.7 >nul&cscript //nologo ospp.vbs /act
Finally, please open your Office app then check that the notification was removed.
Method 2. Disable optional connected experiences
How to disable the annoying notification bar on Microsoft Office apps.
Step 2.1: Open your Office app.
Just start the Office program which has annoying notification.
Step 2.1: Open Privacy Settings.
Goto File > Options > General > Privacy Settings or Home > Trust Center > Trust Center Settings > Privacy Options > Privacy Settings. At this dialog box, uncheck the “Enable optional connected experiences” option.
Disable optional connected experiences
Step 2.3: Restart your Office app.
Close your app and reopen it to apply changes to the settings.
After completing the above steps, the notification should be gone.
Ref: Remove “You may be a victim of software counterfeiting” notification – MS Guides