So you are able to install it. But when check the App store you don't see that you have it?

no sorry. Able to install 10.12.6, 10.13 never shows up, so I am never able to install it.

@Bhughes and you do see it to download in https://developer.apple.com/download/ ?

I do, and I did, it installed, launched the app store, and it says "no updates available."

well thats kinda nuts. Might just want to contact the apple on that. Sounds like an issue with your account if its happening on different devices.

Totally. I made our apple engineer aware, he said he had heard of some others having the same issue. He is looking into it.

bananas

I heard back... I had to accept a new invitation for AppleSeed first, (I was already enrolled) I should have access to it within 24-hours I am told. Not sure what that's all about, but I will keep ya posted.

I noticed the same problem. After enrolling the device to the dev program, App Store checks for updates but no 10.13 is shown.
Searching for 10.13 in the search bar didn't work either. I found the following link: macappstores://itunes.apple.com/app/id1209167288 to download the Installer app.

be careful when discussing Apple Beta stuff here. Please use the Apple developer/beta forums for discussing that.