Outlook with on-prem Exchange server after O365 Migration

We just migrated a client from Exchange 2010 on premises to Exchange Online using the cloud only method. I currently have all the Exchange services disabled on the Exchange server and have new Outlook profiles configured for the O365 accounts and everything works fine.

The problem is that every couple of days a person or two will tell me they are being prompted for their credentials and their password is not working. When I look at their profile, it has reconfigured itself to point to the local server name. im not sure how a functional live profile just changes itself but im not sure where else to look.
ElementITAsked:
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Vasil Michev (MVP)Commented:
Doesn't seem like you have disabled everything locally. In any case, you can 'instruct' Outlook to bypass the local autoDiscover responses by deploying the reg keys in this article: http://support.microsoft.com/kb/2212902

The only thing you need working for Exchange Online is the HTTP redirect method.
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Damien KayCommented:
Sounds like you have an internal Autodiscover issue...
Here are some articles that may help:

Complete post migration tasks
https://support.office.com/en-nz/article/Perform-a-cutover-migration-of-email-to-Office-365-9496e93c-1e59-41a8-9bb3-6e8df0cd81b4#ConfigurMXRecord

How to disable the on-Premises Autodiscover service
http://365command.com/autodiscover-service-and-how-to-disable-it-on-premises-justins-tech-tip-of-the-week/ 

Hope this helps!

damien
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ElementITAuthor Commented:
Thanks for the replies. I will try these today and report back as to what worked.
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