Turn off the cloud features in Office 2013 using the Registry

Registry Hive = HKEY_CURRENT_USER
Registry Path = Software\Microsoft\Office\16.0\Common\SignIn
Value Name = SignInOptions
Value Type = REG_DWORD
Values:
0 Both IDs allowed
1 Microsoft Account only
2 Org ID only
3 None allowed

https://getadmx.com/?Category=Office2016&Policy=office16.Office.Microsoft.Policies.Windows::L_SignInOptions


Using the Group Policy Editor instead

  1. Hit the Windows-r keys again to open the run box on the system.
  2. Type gpedit.msc and hit enter. This opens the Group Policy Editor.
  3. Navigate to the following tree: Local Computer Policy > User Configuration > Administrative Templates > Microsoft Office 2013 > Miscellaneous.
  4. Locate "Block signing into Office" in the list and double-click the entry.
  5. Select Enable from the window that opens up and "none allowed" to disallow the sign-in.