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.
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Thank you so much for this!! I had no clue this setting existed, or would be disabled. I am assuming it is like this to save memory, but for any...
This actually happened to me today due to firewall at my company. Using another network fixed it - try tethering to your phone for sign-in.