I’m trying to send push notifications using the Firebase Admin SDK, but I’m not receiving any notifications.
The error “Requested entity was not found” occurs.

I use ServiceWorker for subscription, and the returned endpoint is “https://fcm.googleapis.com/fcm/send”
It becomes.
URL after migration to HTTP v1 “https://fcm.googleapis.com/v1/projects/myproject-ID/messages:send”
We predict that the push notification will be successful if the .
I would like to know how to change the endpoint when subscribing.

The web push certificate key is set in the applicationServerKey option when subscribing.
I changed to OAuth 2.0 access token, but the subscription fails.