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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I was having a similar issue as everyone here but what worked for me was going to File>Build Settings [ATTACH] I switched Platforms from PC/MAC to...
This is what fixed my issue. I'm a new user and I was having this issue on my fresh build but I figured out what was going on for me. [ATTACH]...