Returns the OneDrive Site Url by looking up the user in Microsoft Graph by either email address or UPN.

Get-DriveUrl.ps1

[System.Net.WebRequest]::DefaultWebProxy.Credentials = [System.Net.CredentialCache]::DefaultCredentials 
[System.Net.ServicePointManager]::SecurityProtocol = "Tls11", "Tls12"

Import-Module SharePointPnPPowerShellOnline

function Get-DriveUrl
{
    [cmdletbinding(DefaultParameterSetName='UserPrincipalName')]
    param
    (
        [Parameter(Mandatory=$true,ParameterSetName='UserPrincipalName')]
        [string]$UserPrincipalName,

        [Parameter(Mandatory=$true,ParameterSetName='EmailAddress')]
        [string]$EmailAddress
    )

    begin
    {
        $token = Get-PnPGraphAccessToken
    }
    process
    {
        if( $PSCmdlet.ParameterSetName -eq "EmailAddress" )
        {
            $uri = "https://graph.microsoft.com/v1.0/users?`$filter=mail eq '$EmailAddress'"
            $user = Invoke-RestMethod -Method Get -Uri $uri -Headers @{ accept = "application/json"; Authorization = "Bearer $token"} | SELECT -ExpandProperty Value        
            $UserPrincipalName = $user.userPrincipalName
        }
        
        Invoke-RestMethod -Method Get -Uri "https://graph.microsoft.com/v1.0/users/$UserPrincipalName/drive" -Headers @{ accept = "application/json"; Authorization = "Bearer $token"} | SELECT -ExpandProperty WebUrl | % { $_ -replace "/Documents$", ""}
    }
    end
    {
    }
}

$tenant              = "contoso"
$clientId            = "8a6b10a8-1234-1234-1234-9b8e49b6f6b7"
$CertificatePath     = "C:\_powershell\AADAppPrincipalCertificates\AppPrincipalCert.pfx"
$CertificatePassword = ConvertTo-SecureString -String "pass@word1" -AsPlainText -Force


Get-DriveUrl -UserPrincipalName "adamb@josrod.com" 
Get-DriveUrl -EmailAddress      "adam.bar@contoso.com"