Error service node

Hi, I have this process:

Script_CreateJsonCrearCita

creates a variable:
image

Service_CrearCita

uses that variable to call a webservice:

when checking the variable, it is correct:

image

this is the complete json:

“crearCitaJSon”: {
“Accion”: “CrearCitaCalendario”,
“CalendarId”: “UCHBotTest@ceu365.onmicrosoft.com”,
“ServiceId”: “79c7f886-5dc4-4d18-a98e-e09edbc92802”,
“CustomEmail”: “lginer@uchceu.es”,
“CustomerName”: “Lorena Giner”,
“StartDateTime”: “2022-12-23T16:00”,
“EndDateTime”: “2022-12-23T16:15”,
“CQ”: [
{
“id”: “2370e702-c93f-43da-a029-5c41b187129d”,
“answer”: “Kudsk”
},
{
“id”: “cd5bfb65-9078-4fa9-9220-94e993cbc632”,
“answer”: “56”
}
]
}

but the service is returning the following error: Data received from endpoint is not a valid json

image

I have tried the same json in the backend and the service is working properly.

Any idea what’s happening? hope you can help me

Thanks