Flex Layout Entry Not Centering Text

I have an entry box inside of a flex layout. I want the entry to display across the whole screen with some margin and still have the text/placeholder text centered. I currently cannot get the entry to have it's text centered nor apply a margin to the left and right sides.

What I want:

What I'm getting:

Code Inside a content page and with relevant parts:

<FlexLayout Direction="Column"
                    AlignContent="Center"
                    AlignItems="Center"
                    JustifyContent="SpaceEvenly"
                    HorizontalOptions="FillAndExpand"
                    VerticalOptions="FillAndExpand">
`
`
            <Image Source="Banner.png"
                   Aspect="AspectFit"
                   Scale="0.85"/>

            <StackLayout x:Name="ControlsHolder_StackLayout" 
                         Orientation="Vertical"
                         HorizontalOptions="FillAndExpand"
                         VerticalOptions="FillAndExpand"
                         Spacing="20">

                <Label x:Name="WelcomeMessage_Label"
                       Text="Welcome to the General Aire contractor App.
                             Please enter your general Aire contractor number to begin."
                       HorizontalTextAlignment="Center"
                       HorizontalOptions="CenterAndExpand"
                       TextColor="White"
                       FontSize="Small" />

                <Entry x:Name="ContractorNumber_Entry"
                       HorizontalTextAlignment="Center" 
                       Placeholder="Enter Contractor Number"
                       PlaceholderColor="{StaticResource GFI_Gray}"
                       TextColor="White"
                       FlexLayout.AlignSelf="Center"
                       HorizontalOptions="FillAndExpand">
                </Entry>