Hi @Brian Hargis ,
According to my search, this issue occurs when the name of the pre-migration Autodiscover server is cached in your Outlook profile in the registry.
You need to configure one of the following registry subkeys as follows:
HKEY_CURRENT_USER\Software\Microsoft\Office\<x.0>\Outlook\Autodiscover
DWORD: ExcludeLastKnownGoodUrl
Value: 1
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\<x.0>\Outlook\Autodiscover
DWORD: ExcludeLastKnownGoodUrl
Value: 1
Besides, if that doesn't help, try to create a new profile from control panel:
Control Panel > Mail > Show Profiles
Type a name for the profile, and then select OK, then re-connect your account.
Hope above suggestions may help you!
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.