Pre order greyed out

Hi,

I'm releasing an album in March and wish to setup a pre-order with a bunch of songs to listened to before the official release. I followed the step given by bandcamp but the "save as pre order" part is geyed out, I can' click the option. So I end up publishing the album, thinkning that it can unnlock the pre-order, but I end up with the album published with all the songs availiable.

I put the album on private for now and I don't know what to do. Can someone help ?