UAE used to support Taliban before 9/11, but lot of things have changed. Now, UAE is the strongest anti-islamist arab state(maybe too much). UAE put pushed KSA to fight against AQAP in Yemen(which is good). They back Haftar, Sisi(which is not that good). So on… So I guess they wouldnt support Taliban in any way. UAE also has some troops deployed in Afghanistan. Taliban doesnt want UAE to step up their support for AFG government.