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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Down for me as well, I was going to switch to the beta release bt i guess not currently. Hopefully not something worse than a simple outage. I...
Not OP, But I too have this issue. I recently did a fresh install of unity on a new system. Imported my project, and everything has been fine....