What is the outlook version is it
Outlook 2016 plain
OR
Office 2016 for Office 365 business - If it is this then it will connect directly to office 365 mailbox
Office 2016 for Office 365 business - If it is this then it will connect directly to office 365 mailbox
Then you need to add registry key.
HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\office\16.0\outlook\autodiscover DWORD: ExcludeExplicitO365Endpoint Value = 1
Then restart your computer and it should stop trying to connect to Office 365.
Starting in Outlook 2016 version 16.0.6741.2017, Microsoft has enabled a new feature called Direct Connect to Office 365. If you have exchange server and this client Office 2016 for Office 365 business is designed to connect directly to O365 then you need to add the registry key.
HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\office\16.0\outlook\autodiscover
DWORD: ExcludeExplicitO365Endpoint
Value = 1
Then restart your computer and it should stop trying to connect to Office 365.
You are looking wrong information. Look for office and not outlook.
You need to look for outlook only after \office\16.0\outlook\autodiscover
This is expected behaviour.
If all mailboxes are migrated from onpremise exchange server you need to disable autodiscover on exchange server.
Try to set Set-ClientAccessServer –Identity “CASxx” –AutoDiscoverServiceInternalUri $NULL
By running these steps/commands, you are essentially removing the on-premises information with regard to Autodiscover; thus eliminating the conflict that your end users are experiencing between the O365 autodiscover and the on-premises one.