The Office 365 pre-installed by the newly purchased brand machine OEM cannot be activated, or the trial, purchase, and activation window is always prompted after reinstalling Office2016
The solution is to delete the office 365 registration form pre-installed by the OEM manufacturer
1. Open the run (Win+R) window and enter regedit and press Enter or click OK
2. Find the table values in sequence according to the following path, select OEM and right-click to delete (, and then click OK.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\16.0\Common\OEM
3. Next, follow the following path to find the OEM in turn, right click to delete and confirm.
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\16.0\Common\OEM