During the Autopilot ESP screens, right when the 'Account setup' phase starts, we are prompted with a UAC 'Optional Features' prompt (see screenshot below).
This only happens when selecting certain countries in the OOBE 'Region' screen. If we select United Kingdom or Australia, we see the prompt, if we select Switzerland we don't see the prompt.

The user does not have admin credentials to use in the prompt, so the only option is to click 'No' at which point the ESP then continues as normal.
However, this is very confusing to the end user and we need a way to prevent this UAC prompt from showing, regardless of which country was selected.
Note:
Our Windows Autopilot deployment profile is configured to a 'Standard' User account type.
Changing it to 'Administrator', the UAC prompt does not show. However, this is not a viable workaround as we require our users to be Standard users.