在编译默认的URP 2D项目时，出现这样一个错误：
No cloud project ID was found by the Analytics SDK. This means Analytics events will not be sent. Please make sure to link your cloud project in the Unity editor to fix this problem.

原因：

项目中的三个Package（Analytics，Advertising，In-App Purchases）需要Unity Service，所以需要关联Unity线上项目的ID。

解决方案：

1. 如果你需要这三个Package，那么可以关联Unity Project ID。

Edit => Project Settings => Services => Create Project Id，或者选择一个已有的ID。

2. 如果不需要这三个Package，可以在Package Manager中移除它们即可。

Windows => Package Manager

参考：

What does "No Cloud ProjectID Found for Analytics" error mean? - #2 by Modeus - Questions & Answers - Unity Discussions