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Outlook 2016 frequently prompting for credentials

mmj1
mmj1 asked
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Last Modified: 2018-12-12
I am having an issue with Outlook 2016 frequently prompting for the username and password for the server:  smtp.mail.yahoo.com  
It did this when I had the mail setup as POP account on my older PC (Windows 7)  - I then purchased a new PC (Windows 10) and setup the email as IMAP and I am still getting this frequent pop up.  The username and password are correct.  I did not have this issue with previous version of Outlook.  Any help you could provide would be appreciated.  Thank you.
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Mike SchrockIT Operations Manager
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Commented:
Greetings MMJ1,
This is due to O365 trying to constantly connect. There is a registry key that fixes this issue.
As always please backup the registry prior to making changes.

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

Author

Commented:
Mike, thank you so much for your response.  I will certainly give this a try as this is so frustrating.  Just to confirm, my PC is a standalone (not connected to Exchange server) and Outlook 2016 is setup with the IMAP settings for a Yahoo server (my email address is @bellsouth.net - but is accessed through Yahoo servers)  I will back up the registry before making this change.  So, to verify, I am adding a DWord entry in the  location you specified and the value data will be 00000001 - is that correct?
Mike SchrockIT Operations Manager
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Commented:
Hello MMJ1, I understand the frustration all too well, it cursed a few of my users for a good week or so. This will work in standalone or domain environments.

Author

Commented:
ok great.  I will give it a try and let you know.  Thanks again.

Author

Commented:
Mike - I tried to locate the path in the registry and it wasn't there. So, on my new I just opened the Office applications that were pre installed and that is probably not a local install.  I have licenses to install the local copy - so would you recommend I download the Office apps and install locally?  Then correct the registry?
Mike SchrockIT Operations Manager
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Commented:
Those applications are normally installed locally. The key might differ from version of office, was the entire string missing or did it not follow along after a bit?

Author

Commented:
The path was HKEY_CURRENT_USER\Software\Microsoft
- No "office" after that
Mike SchrockIT Operations Manager
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Commented:
Interesting, Office 2016 is installed?

Author

Commented:
The local copy of Office 2016 (O365)  was not installed so I have installed it.  Under regedit - I now can navigate to the following path:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\
However, "AutoDiscover" is not listed under Outlook
IT Operations Manager
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Commented:
This problem has been solved!
(Unlock this solution with a 7-day Free Trial)
UNLOCK SOLUTION

Author

Commented:
As we have not had the pop up in a few days, I am going to leave things as they are for now.  I do appreciate all of your assistance in trying to resolve my issue.  Thank you.