Feb 24, 2026

Outlook : AutoDiscover Keep On Prompt For Password

Unsure what is the root cause for this, but after some updates (maybe); Microsoft Outlook 2016 and onwards keep on prompting User to key-in the password.

The password prompt keep on appearing albeit no password change was performed and the password confirmed to be correct when keyed-in, it will still says incorrect account or password.

A simple registry tweak solved the problems. Copy the below script and save it as *.reg file or you can manually browse to the path specified below and amend accordingly.


Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover]
"ExcludeExplicitO365Endpoint"=dword:00000001



!!! HAPPY COMPUTING !!!


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