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mmj1Flag for United States of America

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Outlook 2016 frequently prompting for credentials

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 Schrock
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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
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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?
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.
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ok great.  I will give it a try and let you know.  Thanks again.
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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?
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?
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The path was HKEY_CURRENT_USER\Software\Microsoft
- No "office" after that
Interesting, Office 2016 is installed?
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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
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Mike Schrock
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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.