Outlook 2013 Standard keep asking password when shared mailbox auto mapping

[Dino2019]

license@microsoft.com <- licensing mailbox

shared@microsoft.com <- shared mailbox

If granted permission to the licensing mailbox access the shared mailbox, on the Outlook 2013 Standard will show the Windows Security Alert and asking the password. Even the password is correct, the Outlook will still asking the password. 

If removed the permission, the mailbox will resume normal.

On Outlook 2016 Standard, the licensing mailbox and shared mailbox are working normally.

Does anyone have this issue on Outlook 2013 Standard ?

[#2]

Is this for O365/Exchange online? Where are the mailboxes located? Do you have Modern authentication enabled?

[#3]

@Vasil Michev 

Yes, we are using O355 include exchange online. (Licenses - Office 365 Business Essentials)

The MFA is disabled.

I found out this issue is caused by a shared mailbox info@xxxx.com only.

If granted the permission to access other shared mailbox, no any issue will happen.

But no any difference between these shared mailboxes setting......