Private/Get-KB4RegionBaseUri.ps1

function Get-KB4RegionBaseUri
{
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [ValidateSet('US', 'EU', 'CA', 'UK', 'DE')]
        [string] $Region
    )

    $baseUris = @{
        US = 'https://us.api.knowbe4.com'
        EU = 'https://eu.api.knowbe4.com'
        CA = 'https://ca.api.knowbe4.com'
        UK = 'https://uk.api.knowbe4.com'
        DE = 'https://de.api.knowbe4.com'
    }

    [uri] $baseUris[$Region]
}