Mail send from iPhone not visible from Macbook

Any mail I sent from my iPhone (latest OS) is not visible from my Macbook Pro (latest OS) in the sent box.

I need this to be fixed. How? I have read through the forums and there seems to be no fix to this. And yes, I have everything configured properly (ie. to keep sent messages on server, etc).

Any help to fix this would be appreciated as I need to access all my emails for work from my computer.