Microsoft Outlook 2013 Credentials Prompt Autofilled Username

I'm having some questions about the autofilled username when Outlook prompts for password. Current account is AD account is linked to Office365 and
SSO is enabled so since username now is UPN which is different from email address. Sometimes Outlook will autofill the email address and sometimes the UPN. How do i control it so that only UPN is autofilled every time?

Hi,
Do you mean your Outlook 2013 is always prompted for credentials with auto-filled username?
Please try to clean up the cached credential in your computer. Then fill in with the format of UPN when it prompted for credentials next time and check the Remember my credential to save it. About how to remove cached credentials, please
follow these steps:
1. Launch the Credential Manager from
Control Panel > All Control Panel Items > Credential Manager.
2. In the Generic Credentials section you’ll see a setting for [MS Outlook] which will include your SSO details. Click the downward-pointing arrow to the right of that value.
3. In the expand details, click Remove from vault. Then Outlook will no longer have a stored copy of your password.
Thanks,
Winnie Liang
TechNet Community Support

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Hi Brian,
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Suggest you take a look at this thread
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Hello,
How did you set the Logon network security under More Settings on the Microsoft Exchange
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To verify this, please follow these steps:
1. Launch Control Panel.
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5. In the Change Account dialog, click
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8. Click Next and click
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9. Click Close on the
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Forum Support
Come back and mark the replies as answers if they help and unmark them if they provide no help.
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Greetings,
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Hi,
For the issue that Outlook keeps prompting for password, I usually suggest users follow the steps in this article below, but apparently you have tried almost all the steps:
Why does Outlook keep prompting for password
I've seen some similar issues that were caused by an old "network driver", which for some reason caused a wrong server name to propagate up from the network layer to the application layer. Updating the network driver would fix the issue, I'm
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Regards,
Melon Chen
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs. Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

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Hi James_wilson,
Any update?
Just additional, would you please let me know whether have installed all updates for Outlook 2013? If hasn’t, please install and then monitor the result.
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Hi Shuvo,
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Outlook 2013 password prompts

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Hi
Check your credential manager for any old passwords. Is this an exchange or pop account? Try changing your authentication method in outlook to use basic instead of NTLM and see if the popups disappear.
Hope this helps. Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

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Hi,
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It's recommended to download and install
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Microsoft Outlook 2013 Credentials Prompt Autofilled Username

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