Unfortunately right now the beta is full. You can check the cards at the very top of this app, if someone drops out a spot will open. Also if Samsung releases Beta 3 they should open it up to more people.
Hello @rstorms20 ,
One UI 4 Beta Program is now open for registration exclusively for Samsung Unlocked Z Flip 3 devices. Please refer to Samsung Members app banner section or benefits section to register for the Beta Program.
One UI Beta Team