This issue still has not been resolved by Intuit. Years later, and the service date will still not show on custom uploaded invoices. And before any of you QBO agents try to offer the basic steps of how to setup a custom invoice, I can confirm everything is setup correctly. It simply doesn't work. It's a software failure. 

And the thing thats far worse than the glitch? The fact that Intuit has failed to resolve it after multiple years and many complains. You're a multibillion dollar company - get your act together.