Flying UA and see from my boarding pass that I have Premier access.

I’m non status flying Y

I did “look” at the option for adding this to my booking before I checked in but never “purchased" it nor can see a charge on my UA chase account for this add-on.

I checked in on line later in the day and did not see the option to add this when I checked in

Is this something that will be charged if I use the premier entrance?

Am I missing something?

Any one else experienced this?

Thanks for any replies