Recaptcha verification failed - MALFORMED

[ShahzadAhmad]

We are sending the complete body as the documentation explain.

We are trying to send verification code to phone number using sendVerificationCode endpoint. But got "Recaptcha verification failed - MALFORMED". we are sending the complete body as the documentation explain.

Actually I am doing this:

1- Call  https://identitytoolkit.googleapis.com/v1/recaptchaParams

2- Call https://identitytoolkit.googleapis.com/v1/accounts:sendVerificationCode with the recaptcha token of the first enpoint call.

The body: "phoneNumber": string, "recaptchaToken": string,

Then i get this error:

"CAPTCHA_CHECK_FAILED : Recaptcha verification failed - MALFORMED"

Are we missing something?

Thanks