sharepoint online – Configure team site libraries to sync automatically not working

I am using the “Configure team site libraries to sync automatically” GPO to add automatically a SharePoint site to our working environment.

The GP writes correctly the entry under HKCUSoftwarepoliciesMicrosoftOneDriveTenantAutoMount

But after waiting couple of days, the site still does not show in File Explorer.

Our working environment are Windows Server 2016. Could it be the problem?
I would assume not because I can add manually the site if I sync manually.

What am I missing?

Thanks

Christophe