C# Unity中的Google持久性云锚：错误缺少API密钥

问题：

我正在尝试在Unity中托管持久的google云锚。为此，我使用了无钥匙身份验证，并按照google开发者指南遵循了所有步骤： [Unity中持久云锚的google开发者指南][1]

我使用的是Unity Editor 2020.2.3f1、ARFoundation和Firebase 7.2.0

但我仍然得到以下错误：

Error ARCore-AnchorServiceClient Error calling CreateAnchor RPC: 
Error ARCore-AnchorServiceClient grd: PERMISSION_DENIED: The request is missing a valid API key.
at grb.i(PG:1)
at hem.c(PG:3)
at guh.run(PG:1)
at guj.e(PG:4)
at guj.c(PG:1)
at gtc.a(PG:3)
at gtv.run(PG:2)
at hav.run(PG:2)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)

有没有办法在Unity中使用ARFoundation托管持久性云锚？ [1] :