Microsoft 365 – Outlook issue : Mails are not opening. Something went wrong. or 400 Bad Request Please try the recommended action below. – Refresh the application

Hi All,

Greetings for the day!!!

Today new issue and solution .

Today discussing about – Microsoft 365 outlook – mails are not opening . 400 Bad Request

I was logged in to my SharePoint online portal and to check the mails I opened OUTLOOK from launch pad as in below snap.

But OUTLOOK does not opened

Issue: We are getting the error as in below snap.

Something went wrong

Please try the recommended action below

• Sometime we get – 400 Bad Request as

• If we notice bit detailed error snap, we will found some more error details like

Unhandled Rejection : Error: 500 : undefined

err: Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssigned

emsg: UserHasNoMailboxAndNoLicenseAssigned

• Also if we go to “Active users” section, select the respective user and check “Mail” tab –https://admin.microsoft.com/Adminportal/Home#/users/
• We have detailed article to navigate to Microsoft 365 admin center – please have a look – Small Tips and Tricks – SharePoint admin center – How to navigate to SharePoint admin center – https://microsoft365junction.com/2022/12/07/small-tips-and-tricks-sharepoint-admin-center-how-to-navigate-to-sharepoint-admin-center/
• We will found the message – “This user doesn’t have an Exchange Online license” as shown in below snap

Solution

• From above errors its clear that the respective user do not have “Exchange online” license
• We can verify this as in below snap from Users – “Licenses and apps” tab as
• From apps tab we could see that “Exchange Online (Plan 2)” app is disabled – we need to enable it

• Enable the app – “Exchange Online (Plan2) “
• Lets again check “Mail” tab – we will see the updated message – “We are preparing a mailbox for the user.“

• As mailbox prepared successfully for the user we will see the respective details under “Mail” section / tab

• Now if we try to open the “Outlook” it will open successfully as

REFERENCES

• How to navigate to SharePoint admin center – https://microsoft365junction.com/2022/12/07/small-tips-and-tricks-sharepoint-admin-center-how-to-navigate-to-sharepoint-admin-center/

Thanks for reading. Stay tuned for all Microsoft 365 updates / details / issues – solution / tutorials 🙂

HAVE a FANTASTIC LEARNING AHEAD ! LIFE IS BEAUTIFUL 🙂