Let’s go a step at a time… I find that your post is very confusing.
Have you installed the BO 6 Beta ?
If no, see the following 2 topics:
If BO 6 Beta is installed, but will not launch, you need to contact Activision. See Having Problems with Call of Duty? Read this first! for details.
If you have ordered / purchased a digital edition of BO 6, you won’t get a code; see point # 2 of Call of Duty: Black Ops 6 Open Beta FAQ for details.