How to display a list of OneDrive for Business site collections https://technet.microsoft.com/en-us/library/dn911464.aspx

GetOD4BSites.ps1

# Specifies the URL for your organization's SPO admin service
$AdminURI = "https://tenantname-admin.sharepoint.com"

# Specifies the User account for an Office 365 global admin in your organization
$AdminAccount = ""
$AdminPass = ""

# Specifies the location where the list of MySites should be saved
$LogFile = "~\Desktop\MySites.txt"


# Begin the process

$loadInfo1 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
$loadInfo2 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")
$loadInfo3 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.UserProfiles")

# Convert the Password to a secure string, then zero out the cleartext version ;)
$sstr = ConvertTo-SecureString -string $AdminPass -AsPlainText -Force
$AdminPass = ""

# Take the AdminAccount and the AdminAccount password, and create a credential

$creds = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($AdminAccount, $sstr)


# Add the path of the User Profile Service to the SPO admin URL, then create a new webservice proxy to access it
$proxyaddr = "$AdminURI/_vti_bin/UserProfileService.asmx?wsdl"
$UserProfileService= New-WebServiceProxy -Uri $proxyaddr -UseDefaultCredential False
$UserProfileService.Credentials = $creds

# Set variables for authentication cookies
$strAuthCookie = $creds.GetAuthenticationCookie($AdminURI)
$uri = New-Object System.Uri($AdminURI)
$container = New-Object System.Net.CookieContainer
$container.SetCookies($uri, $strAuthCookie)
$UserProfileService.CookieContainer = $container

# Sets the first User profile, at index -1
$UserProfileResult = $UserProfileService.GetUserProfileByIndex(-1)

Write-Host "Starting- This could take a while."

$NumProfiles = $UserProfileService.GetUserProfileCount()
$i = 1

# As long as the next User profile is NOT the one we started with (at -1)...
While ($UserProfileResult.NextValue -ne -1) 
{
Write-Host "Examining profile $i of $NumProfiles"

# Look for the Personal Space object in the User Profile and retrieve it
# (PersonalSpace is the name of the path to a user's OneDrive for Business site. Users who have not yet created a 
# OneDrive for Business site might not have this property set.)
$Prop = $UserProfileResult.UserProfile | Where-Object { $_.Name -eq "PersonalSpace" } 
$Url= $Prop.Values[0].Value

# If "PersonalSpace" (which we've copied to $Url) exists, log it to our file...
if ($Url) {
$Url | Out-File $LogFile -Append -Force
}

# And now we check the next profile the same way...
$UserProfileResult = $UserProfileService.GetUserProfileByIndex($UserProfileResult.NextValue)
$i++
}

Write-Host "Done!"