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  • Hi
    We had similar issue with office 2016 once we started migrating to cloud.
    Try checking these 2 reg keys:

    Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity.”
    Verify if there is a DWORD value named “EnableADAL” that is set to 0

    HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover
    Create a DWORD (30-bit) value for ExcludeExplicitO365Endpoint and change the value to “1” to enable it.

    Test each one see if that helps.
    Best,
    Sean

    Pepper graySpice (2) flagReport
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  • Never did find a solution.

    I tried an awful lot of different things.

    I believe we are going to contact an outside vendor to try and fix the issue. I've done everything from registry edits to rebuilding the profiles, I've edited the DNS settings and done so much that it seems nothing fixes this. I wish there was a way I knew to trouble shoot it so I can see exactly why and where it fails. It's asking for credentials it already has.

    Pepper graySpice (1) flagReport
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  • Hello, Noob Spicebot, I have several solutions for you. Check, which one suits you the best.  

    a) Launch OWAOpens a new window. If you can log into it, restart the application of Outlook.  

    b) Use the email when it prompts for the credentials and mark "remember credentials". Hit Cancel if it asks again. If it repeats after canceling, go to the 'c)' step.  

    c) Double-check if prompting for Credentials is not configured in the profile. For details, see this articleOpens a new window.  

    By the way, I also recommend contemplating the importance of Microsoft 365 backupsOpens a new window, as you should be ready for any unpredictable situation at our times.

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  • Aleks (NAKIVO) wrote:

    Hello, Noob Spicebot, I have several solutions for you. Check, which one suits you the best.  

    a) Launch OWAOpens a new window. If you can log into it, restart the application of Outlook.  

    b) Use the email when it prompts for the credentials and mark "remember credentials". Hit Cancel if it asks again. If it repeats after canceling, go to the 'c)' step.  

    c) Double-check if prompting for Credentials is not configured in the profile. For details, see this articleOpens a new window.  

    By the way, I also recommend contemplating the importance of Microsoft 365 backupsOpens a new window, as you should be ready for any unpredictable situation at our times.

    OP is -not- using O365.

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  • We're having the same issues with a client, they have 2 domain's with network solutions email.  One domain has been upgraded already and we have no issues.  The other domain has not been upgraded to their new platform and every user is getting the outlook password prompt popup every 30min more or less.  Click ok or cancel and it goes away and works for a while.  Network Solutions support is no help, every time we contact them they tell us no problems on their end.

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  • Joe88 wrote:

    We're having the same issues with a client, they have 2 domain's with network solutions email.  One domain has been upgraded already and we have no issues.  The other domain has not been upgraded to their new platform and every user is getting the outlook password prompt popup every 30min more or less.  Click ok or cancel and it goes away and works for a while.  Network Solutions support is no help, every time we contact them they tell us no problems on their end.

    Interesting, yeah they are of no help at all.

    I get different directions depending on who I talk to and it's very frustrating.

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  • Did you do that registry change mentioned above?

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  • Da_Schmoo wrote:

    Did you do that registry change mentioned above?

    I did try that and it made no difference.

    Pepper graySpice (1) flagReport
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  • I'd hold down the CTRL key, right-click on the Outlook icon in the system task bar area, click Connection Status and see if anything in their looks wonky.  Also try the Test Email Autoconfiguration and see if everything looks normal.  Obviously Outlook is trying to connect to something and failing.  Maybe one of those two procedures will shed some light on what it is.

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  • I came here looking for a solution, but it doesn't look like you have found one yet. If so, please let me know. This is becoming more and more of an issue for us. We are using Rackspace (Rackspace)​ for our email hosting. Our number of affected users is slowly growing. This is affecting both IMAP and Exchange accounts. It is affecting users from different domains and anything from Office 2019 (& 2021) Home & Business to O365 licenses.

    I have deleted profiles and recreated them. I've deleted credentials and re-saved them. I've also tried switching from "Exchange" to "Exchange 2013 or earlier" for the account type. Nothing resolves the problem. I'm suspecting this is a "product enhancement" by Microsoft that changed all of this.

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