JWT - Not creating a Firebase user

.flutterflow.io/data-and-backend/firebase/authentication/jwt-token

stuck in step 3, I get the .token find, i even display it in an alert, but then when trying to reach firebase I get error in the console: index.ts:121 POST https://identitytoolkit.googleapis.com/v1/accounts:signInWithCustomToken?key=[myFirebase ID] 400 (Bad Request)

I know is not my JWT server, I tried with dummyjson and have the same issue.

my goal is to have the user in the firebase authentication just like the tutorial in step 5

Test token:

{"header": {"alg":"HS256","typ":"JWT"}, "payload": {"id":15,"username":"kminchelle","email":"[email protected]","firstName":"Jeanne","lastName":"Halvorson","gender":"female","image":"https://robohash.org/autquiaut.png","iat":1696013056,"exp":1696016656}}

thank you.

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