Incoming emails hidden outlook 365

I'm using Outlook 365. Have several email addresses. Two of them, the incoming emails do NOT go into the "in box" and I can't find them. However, when I do a search for a specific word of my test email, that missing email shows up and is displayed. I just don't know where it is prior to that. It's as if that incoming email is missing or hiding somewhere. Appreciate the help!