Outlook 365 prompting for login credentials

We have an SBS 2011 server which is working well. We have just upgraded one of our office Windows 10 laptops to MS Office 365. The problem we have is that when Outlook opens it it pulls down all the new emails etc and is connected to Exchange. As soon as it finishes this updating process a windows credentials box appears and asks you to put in the password. In the username it has the correct email address but shouldn't this be the users username not email. Either way if you put in the password it accept this and connects again and then after a small random time period it does the same thing. Its like it forgets the credentials.

We have tried deleting the credentials in credential manager but same thing  

Any help would be appreciated?
LVL 1
QuarmAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Omar SoudaniSenior System EngineerCommented:
Try removeing cached mode in Outlook, and see if issue happens.

In a similar case some time ago, I put Outlook 2016 in online mode (not cached) and prompt disappeared. Put it back to cached mode and all was good.

https://community.spiceworks.com/canonical_answer_pages/8-windows-credential-manager-not-storing-outlook-password
0
FOXActive Directory/Exchange EngineerCommented:
It should be using the UserPrincipalName and the password.  If the UserPrincipalName is the same as the user's email address you are good to go.  Make sure you put a check in "Remember Credential"

You can also try this-
1.  Make sure credential manager is cleared out again
2.  Close outlook and reopen it in safe mode.   Start> in the run box type       outlook /safe    press Enter
3.  When prompted put in the user's UserPrincipalName, password and put a check in "Remember Credentials"
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Saurabh YadavMCPCommented:
Please try to uninstall the office 2016 then try to install the click to run version downloaded from the portal and also try to clean all the registry entries from the laptop and clean the credential managers. Please follow the below mentioned URL to remove the office 2016 setup manually.

https://support.office.com/en-us/article/manually-uninstall-office-4e2904ea-25c8-4544-99ee-17696bb3027b?ui=en-US&rs=en-US&ad=US

Hope this should work !
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Office

From novice to tech pro — start learning today.