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.
Too bad the website is not working anymore !
Oh my god... It was just as simple as that... I spent lot of time trying to figure out what was wrong... Had this issue suddenly on unity...
This comment helped me in 2019 ! thx :D
I have the same problem… I think the reason is because Unity doesn't run as an administrator (but I Don't know how to do it, seems like unity Hub...