Audodiscover Error on Outlook 2007/2010

Hello,

I migrated Exchange 2010 to Exchange 2013 server. Outlook 2007 and 2010 clients are not connecting with Exchange 2013 server and showing disconnected. I ran the outlook test connectivity and found issue that autodiscover errorhttps://autodiscover.domain.com/autodiscover/autodiscover.xml failed (0x800C8204). After finding this, ran Get-autodiscover CMDlet on powershell to view the internal and external URL which was blank no record shown.

My question is that autodiscover URL is necessary set an internal/external or it should be blank. kindly guide.

Thanks