confused about restrictions in Seattle

I've been driving uber in washington state (particularly in the olympia area) for 2 years now and was wondering why I can't take passengers in the seattle area? I can drive about to the edge of the Fife and can no longer accept uberx trips. I can accept requested trips to get in or beyondn this seattle while in my area but cannot do anything but uber eats trips when i get here. I would like to do sea/tac airport runs but have always had this issue. Thanks for any help.