Here are a few steps you can follow to troubleshoot the issue of Outlook not displaying emails in conversation view:

1. Make sure the conversation view is enabled – You can check this by going into the View tab in Outlook. Select Show as Conversations and make sure it is enabled.
2. Check your view settings – You can do this by going into the View tab in Outlook. Select Arrange By and then Conversation.
3. Check sorting options – You can do this by opening the View tab in Outlook. Select Sort by and make sure the Conversation option is clicked.
4. Check your inbox folder settings – You can do this by going into the Folder tab in Outlook and selecting Folder Properties. From here, make sure the Read and unread messages box is checked.