Error during send signature request - Email not valid

class DropBoxSigner {
    companion object {
        private val apiClient = Configuration.getDefaultApiClient()
            .setPassword("api token")
    }

    fun sign() {
        val signatureRequestApi = SignatureRequestApi(apiClient)

        val signer1 = SubSignatureRequestSigner()
            .emailAddress("test.user1@dove.it")
            .name("Test User1")
            .order(0)

        val signer2 = SubSignatureRequestSigner()
            .emailAddress("test.user1@dove.it")
            .name("Test User2")
            .order(1)

        val signingOptions = SubSigningOptions()
            .draw(true)
            .type(true)
            .upload(true)
            .phone(true)
            .defaultType(DRAW)


        val data = SignatureRequestSendRequest()
            .title("a title")
            .subject("Request subject")
            .message("Request message")
            .signers(listOf(signer1, signer2))
            .addFilesItem(File("./dropbox-sign.pdf"))
            .signingOptions(signingOptions)
            .testMode(true)

        try {
            val result = signatureRequestApi.signatureRequestSend(data)
            println(result)
        } catch (e: ApiException) {
            System.err.println("Exception when calling SignatureRequestSendRequest")
            System.err.println("Status code: " + e.code)
            System.err.println("Reason: " + e.responseBody)
            System.err.println("Response headers: " + e.responseHeaders)
            e.printStackTrace()
        }
    }
}

 

Code runs but this error is returned:

Exception when calling SignatureRequestSendRequest
Status code: 400
Reason: class ErrorResponse {
error: class ErrorResponseError {
errorMsg: Invalid email
errorName: bad_request
errorPath: null
}
}
Response headers: {Server=[Apache], Access-Control-Allow-Origin=[*], Access-Control-Allow-Methods=[GET, POST, OPTIONS, PUT, DELETE], User-Agent=[HelloSign API], Connection=[keep-alive], P3P=[CP="NOP3PPOLICY"], Access-Control-Allow-Headers=[Authorization, Origin, X-Requested-With, Content-Type, Accept, Request-URL, Referrer-Policy, Referer, Sec-CH-UA, Sec-CH-UA-Mobile, Sec-CH-UA-Platform, Sec-Fetch-Site, User-Agent, X-User-Agent], Date=[Tue, 12 Dec 2023 11:04:41 GMT], Strict-Transport-Security=[max-age=31536000], Vary=[Origin], Set-Cookie=[AWSALBCORS=Cl7ucvVmKGS9HdGnc+aly50OW37r7KwAYfYZAxMPfny5vzI0QrEV40pcbRrPkClxABELt5uFkurQEoSCI/3qqliESOtOn5BymbD0MI4bRhEujK0anS1QRSNb6A+6; Expires=Tue, 19 Dec 2023 11:04:41 GMT; Path=/; SameSite=None; Secure, AWSALB=Cl7ucvVmKGS9HdGnc+aly50OW37r7KwAYfYZAxMPfny5vzI0QrEV40pcbRrPkClxABELt5uFkurQEoSCI/3qqliESOtOn5BymbD0MI4bRhEujK0anS1QRSNb6A+6; Expires=Tue, 19 Dec 2023 11:04:41 GMT; Path=/], Content-Length=[66], Content-Type=[application/json]}
com.dropbox.sign.ApiException: class ErrorResponse {
error: class ErrorResponseError {
errorMsg: Invalid email
errorName: bad_request
errorPath: null
}
}
at com.dropbox.sign.ApiClient.invokeAPI(ApiClient.java:1095)
at com.dropbox.sign.api.SignatureRequestApi.signatureRequestSendWithHttpInfo(SignatureRequestApi.java:1238)
at com.dropbox.sign.api.SignatureRequestApi.signatureRequestSend(SignatureRequestApi.java:1181)
at DropBoxSigner.sign(DropBoxSigner.kt:52)

Can you please help me to understand which mail is invalid?
The two provided in the example are place holders but i can guarantee that the one I've used are valid emails with no blank space around

 

thanks