A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
https://medium.com/@jeffreymlynch/where-are-the-missing-preview-packages-in-unity-2020-3ad0935e4193#:~:text=Here%20are%20two%20ways%20to,and%20sele...