Email autodiscover issue

I have migrated a number of email addresses to the Office 365 platform. Occasionally some of the email accounts can't connect to the 0365 exchange server. If I do a test connection it looks for the local exchange server. If I do an nslookup for autodiscover@domainname on the same pc it finds the outlook.com ok.
If I replace the dns settings on the client pc from the internal dns server to an external (say google.com) it connects fine.
On the local dns server there is not autodiscover settings that I can find. Could the autodiscover settings be configured where the domain is hosted?
James DanahayDirectorAsked:
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FOXActive Directory/Exchange EngineerCommented:
Your CAS server may be pointing to the on premise setup.  Use this command

Set-ClientAccessServer –Identity “YourCASservername” –AutoDiscoverServiceInternalUri $NULL

This command removes on premise information for Autodiscovery.

Good read below
ref link:http://prakash-nimmala.blogspot.com/2014/10/outlook-clients-are-still-pointing-to.html
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Tej Pratap Shukla ~DexterServer AdministratorCommented:
Hi,
This error occurs cause of Autodiscover Issue, where the Outlook Profile has cached in Registry.
Just go through Below Link to know the resolution process to the Error.
https://support.microsoft.com/en-us/kb/3073002
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James DanahayDirectorAuthor Commented:
Hello

This didn't work unfortunately. After the reboot it reverted back to looking at the old auto discovery settings were still showing in the outlook connectivity test
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