Almost all games featured an exclamation point (alpha skip ahead) icon. What to do with it...

That feature is only available to Alpha,Alpha skip aheads & Beta Insiders at the moment.

As you are in the Delta ring you will still need gold to play any games online.

In the alpha skip ahead, still no update. "Alpha Skip Ahead" clearly means something else... :')

Hi, Wuhey

Unfortunately all the Alpha Skip Ahead spots have been filled. I am sure if you carry on reporting, that when they get spaces, you'll get another invite.y

You can join in with the Insider community here: https://www.reddit.com/r/xboxinsiders/new/

It is only for alpha and alpha skip ahead unfortunately for now.

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.