Strange exchange server name in outlook profile

Hi I am performing a migration from Exchange 2007 to Exchange 2013, all is going fine but I have a strange server name in my outlook 2010 profile for a new user I created on Exchange 2013. Instead if seeing the Exchange FQDN name I am seeing a long number user principel  style name.

I have attached a screenshot.
Is this related to autodiscover? I am also getting a security certificate is invalid or does not match the name of the site, even though I have a CA signed certificate and I am sure I have configured all the internal and external virtual directories to be the same.
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vmdudeAsked:
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
This is fine thats how Exchange 2013 works so no need to worry

- Rancy
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vmdudeAuthor Commented:
Update

Ok so I now realise that the server name I am seeing is by design so thats fine.
I have resolved the certificate error by setting running the follwoing command to set the autodiscover to be the same as all the other virtual directorys.

Set-ClientAccessServer -Identity "Ex2013" -AutoDiscoverServiceInternalUri "https://mail.domain.co.uk/autodiscover/autodiscover.xml"

The only issue I now get is that when I set up a new profile it prompts for a username and password. autodiscover finds the email address of user@externaldomain.co.uk however this is the users email address and their domain login details. If i type in the user principel name of user@internaldomain.local then it works fine
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