This blog post will show you how to fix an import ADMX error when trying to upload a third ADMX template to Intune.
The error message that you receive is:
ADMX file referenced not found NamespaceMissing:Microsoft.Policies.Windows. Please upload it first.
The reason Intune gives an error message is that the Google ADMX templates have a prerequisite. Before installing the Google ADMX templates, you need first to install the Windows 11 ADMX templates (Windows.admx and windows.adml)
Use the link below to download the Windows 11 ADMX
To Google, Chrome ADMX is available in the link below.
Once you have downloaded and extracted the Windows 11 ADMX templates, locate the following two files and import them.
Use the Import ADMX menu to Import the files, and once done, you can go ahead and import the Google Chrome templates.