Not all shuttle services can enter the airport terminal areas. They have to have permits to do so.
Prime example SAS cannot pick-up at MIA but can drop off at the area hotels.
We used Go Airport from FLL to MIA area hotel with no issues.
We did book with SAS but they had a minimum 3 person and we were only 2. Since we had to pay more I cancelled SAS and booked a private sedan with Go Airport. Our driver even stopped at a store for us at no extra charge.
"Education is when you read the fine print. Experience is what you get if you don't." Pete Seeger
RTFM = Read The Fabulous Manual aka FAQ;s
A few How To's I put together. How To Search Forums, Add Countdown Clock and Post Pictures.