Outlook New not Showing email on Reading Pane

Recently, I've been having trouble reading emails in Outlook New. Normally, when I select an email, it displays in the Reading Pane.

But I'm having trouble in Outlook New: the error message "Your message can't be displayed right now. Please check your network connection and try again later." This only occurs in the SharedMailbox.

 

There's no problem with my internet connection. After checking some configurations, Outlook New can't read the SharedMailbox because we need convert account to manage setting: 

 

- Open Outlook New setting or Gear Icon

- Go to account - shared with me

- Choose your SharedMail Box

- Click Convert and restart outlook