Activity Tab for all skip ahead insiders

You must be invited to become an Alpha Insider or Alpha Skip Ahead Insider, to do so You must Very active in Xbox, doing missions and report the bugs You see in the system, as much as You do this, so You Will be Very close to become an Alpha Insider. You
must be at least in Delta preview to become an Alpha Insider, but You Just need to be an Insider to be invited to become an Alpha Skip Ahead, but this one is very rare to be invited and there is a certain number of people to be invited, no more than that,
If You were not invited to be Alpha Skip Ahead certain time, so You must wait a Second chance when they Will invite New members.

You tryed ask for support in http://beta.suport.xbox.com/contactus ? maybe there if you chose Hub and then talk with some support agent maybe he/she can help you

To get an invite you must be active and submit quality feedback via the "report a problem" function, I had only been an insider for 6 months when the invite for alpha skip ahead came through.

You can already if you join the insiders program

Alpha skip ahead

Only xbox insider alpha skip ahead users are getting the experimental dashboards.