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The registration token is not a valid FCM registration token (.net)

We are sending the push notifications using Firebase apis. That is getting expired , so we need to upgrade it. We are invoking this from .Net Core 8.0 codebase.
I am trying to use the code step by step provided below. But I am constantly finding this error
https://www.c-sharpcorner.com/article/push-notification-from-c-sharp-net-to-android-using-fcm-http-v1/
“message”: “The registration token is not a valid FCM registration token”,
“status”: “INVALID_ARGUMENT”,