firebase cloud messaging Request contains an invalid argument

Question

I am getting error while sending message using Firebase cloud messaging admin API.

Error message is below

Caused by:

Answer 1

I suspect that your registrationToken has an invalid format. It should be 152 characters.

To confirm that, try building your message with setTopic("test") instead of setToken(registrationToken).

Answer 2

In my case, the problem was that certain keys are not allowed in a notification data payload. Specifically, the key 'from' is forbidden.

Firebase data message payload

Answer 3

Yet another cause of this is that your message is too large:

Notification messages can contain an optional data payload. Maximum payload for both message types is 4KB, except when sending messages from the Firebase console, which enforces a 1024 character limit.

https://firebase.google.com/docs/cloud-messaging/concept-options

Answer 4

One possible cause for this is that the client and server are connected to different firebase projects. Project name appears in the google-services.json file on the client and in the credentials json on the server.

Firebase FCM: invalid-argument

Answer 5

I had my project name uppercased in the URL (strange, because my project name is actually uppercased)