It has been posted many times that they don't work with beta versions! They will work once the operating system becomes certified. Using the search feature would have saved you time and gave you the answer.
During beta program, the software is not yet certified by Google, and therefore Google Pay and other secure services may not work. We apologize for the inconvenience and will post a notice once it becomes certified by Google. You may try again at that time. We appreciate your contribution to the Beta Program.
