Requests to this API identitytoolkit method google.cloud.identitytoolkit.v1.AuthenticationService.SignUp are blocked.

Error Domain=FIRAuthErrorDomain Code=17999 "An internal error has occurred, print and inspect the error details for more information." UserInfo={FIRAuthErrorUserInfoNameKey=ERROR_INTERNAL_ERROR, NSLocalizedDescription=An internal error has occurred, print and inspect the error details for more information., NSUnderlyingError=XXX {Error Domain=FIRAuthInternalErrorDomain Code=3 "(null)" UserInfo={FIRAuthErrorUserInfoDeserializedResponseKey={
    code = 403;
    errors =     (
                {
            domain = global;
            message = "Requests to this API identitytoolkit method google.cloud.identitytoolkit.v1.AuthenticationService.SignUp are blocked.";
            reason = forbidden;
        }
    );
    message = "Requests to this API identitytoolkit method google.cloud.identitytoolkit.v1.AuthenticationService.SignUp are blocked.";
    status = "PERMISSION_DENIED";
}}}}



Firebase Installation registration failed for app with name: __FIRAPP_DEFAULT, error: Error Domain=com.firebase.installations Code=0 "The server responded with an error. HTTP response: <NSHTTPURLResponse: 0x600002e202c0> { URL: https://firebaseinstallations.googleapis.com/v1/projects/XXX/installations/ } { Status Code: 403, Headers {
    "Cache-Control" =     (
        private
    );
    "Content-Encoding" =     (
        gzip
    );
    "Content-Length" =     (
        319
    );
    "Content-Type" =     (
        "application/json; charset=UTF-8"
    );
    Date =     (
        "Mon, 18 May 2020 07:14:45 GMT"
    );
    Server =     (
        ESF
    );
    Vary =     (
        Origin,
        "X-Origin",
        Referer
    );
    "alt-svc" =     (
        XXX
    );
    "x-content-type-options" =     (
        nosniff
    );
    "x-frame-options" =     (
        SAMEORIGIN
    );
    "x-xss-protection" =     (
        0
    );
} }

Tell me how to solve this problem.