When I try to send a picture to my friends via Outlook and go to insert, I get a message that says “We’re still getting set up. Please try again.” What does that mean?

I'm trying to send a picture I took on my iPhone to one of my friends but when I do to the "Insert" menu and click on "Attachments" a message pops up that says, "We're still getting set up. Please try again." What does that mean and how do I fix this problem so I can send pictures through my Outlook email?

Thank you!