Internal URL for exchange autodiscover doesnt match the potential autodiscover url test results

Hi All,

Need your help.

Basically this is a new set up of Exchange 2013 server.When we test the auto discover from the remote analyzer tool, I get the log below:

1. when i run the command:Get-ClientAccessServer | Set-ClientAccessServer -AutoDiscoverServiceInternalUri

- I get this result :https://mail.domain.org.sg/AutoDiscover/AutoDiscover.xml which is supposed to be correct

-however the potential autodiscover any test i make is trying to resolve to https://domain.org.sg/AutoDiscover/AutoDiscover.xml or the website address

-our SSL certificate is only for mail.domain.org.sg

2. I have tried to check all settings on the virtual servers and all are correct.

3. Tried to set external URL again using powershell but no luck.

I might be missing out a step, your help will be much appreciated.

Host autodiscover.domain.org.sg couldn't be resolved in DNS InfoDomainNonexistent.
Elapsed Time: 63 ms.
    Attempting to contact the Autodiscover service using the HTTP redirect method.
     The attempt to contact Autodiscover using the HTTP Redirect method failed.
     
    Additional Details
     
Elapsed Time: 147 ms.
     
    Test Steps
     
    Attempting to resolve the host name autodiscover.domain.org.sg in DNS.
     The host name couldn't be resolved.
      Tell me more about this issue and how to resolve it
     
    Additional Details
     
Host autodiscover.domain.org.sg couldn't be resolved in DNS InfoDomainNonexistent.
Elapsed Time: 147 ms.
    Attempting to contact the Autodiscover service using the DNS SRV redirect method.
     The Microsoft Connectivity Analyzer failed to contact the Autodiscover service using the DNS SRV redirect method.
     
    Additional Details
     
Elapsed Time: 53 ms.
     
    Test Steps
     
    Attempting to locate SRV record _autodiscover._tcp.domain.org.sg in DNS.
     The Autodiscover SRV record wasn't found in DNS.
      Tell me more about this issue and how to resolve it
     
    Additional Details
     
Elapsed Time: 53 ms.
    Checking if there is an autodiscover CNAME record in DNS for your domain 'domain.org.sg' for Office 365.
     Failed to validate autodiscover CNAME record in DNS. If your mailbox isn't in Office 365, you can ignore this warning.
      Tell me more about this issue and how to resolve it
     
    Additional Details
     
There is no Autodiscover CNAME record for your domain 'domain.org.sg'.
Elapsed Time: 1 ms.

Thanks in advance=)