Night mode on delta skip ahead update ring

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.

Not all Insiders have access to not requiring gold for f2p games at the moment.Only Alpha/Alpha skip ahead & Beta rings are testing it.If you are not in any of those rings then you will still need a gold sub at the moment.

I have access im in the delta lvl and it talks about us testing it but it will not work on my Xbox and I’m on the current update for delta and I see the I have a Xbox network id

The Chromium browser was previously only available for members in the Alpha Skip-Ahead ring, but as of the last couple of days, it's not only been rolled out to Alpha members, but also Beta and Delta members. Only the Omega rings have yet to receive it.

Status July 2021

As an Insiders You gotta make a report for all the bugs You see, You must be in Alpha Ring, this ring is the most unstable, but not more than Alpha Skip Ahead, when You decided to join the Insider Program You knew there were a lot of bugs in the preview
OS, You can change another Ring, Beta, Delta or Omega, but the most stable of them is the Omega ring, now it's You who decid which ring You Will choose to recieve updates or If You Will choose to recieve updates like a normal user.

If you talked to an actual Xbox Support Agent saying that, they probably use a Nintendo or PS. But If you're in one of the Xbox Insiders Preview rings like the Alpha Skip Ahead ring, that might be why it won't work. It works fine on my console and I'm
in the Delta ring now but going back to the Public OS version soon. I wish you luck though.