Autodiscover error

Hi,

Have just deployed 3 collocated CAS/MBX servers behind a HLB.

when testing using test-outlookwebservices I get:

[PS] C:\>Test-OutlookWebServices

Source                              ServiceEndpoint                     Scenario                       Result  Latency
                                                                                                                  (MS)
------                              ---------------                     --------                       ------  -------
EXCHANGE01.company.com              autodiscover.company.com            Autodiscover: Outlook Provider Failure      30
EXCHANGE01.company.com              mail.company.com                    Exchange Web Services          Success      22
EXCHANGE01.company.com              mail.company.com                    Availability Service           Success      33
EXCHANGE01.company.com                                                  Offline Address Book           Skipped       0

if using the -debug feature I cannot locate any error in EXPR or elsewhere...

Setup:

Get-ClientAccessServer

AutoDiscoverServiceInternalUri       : https://autodiscover.company.com/autodiscover/autodiscover.xml

Get-OutlookProvider

I have tested EXPR server as empty and with mail.company.com

CertPrincipalName is set to msstd: mail.company.com

WebServicesVirtualDirectory

Both internal and external url is set to https://mail.company.com/EWS/Exchange.asmx

Using 3rd party certificate with autodiscover.company.com and mail.company.com namespaces.

Please advice!