API problem request

API problem request

I'm Brazilian and I don't speak English, I'm sorry if the grammar is incorrect.

I'm trying to consume Zoho Analytics API to send data to a table. The idea is to make a routine that will be executed every day to send the updated data. But when I try to make the request within my API, it returns the error below:

{
  "response":{
    "action":"IMPORT",
    "error":{
      "code":8518,
      "message":"You need to (re)login to perform this operation"
    }
  }
}

Inside postman, I can make the request normally. The strange thing is that it asks to relog, the token is valid.

Has anyone experienced this or know how to resolve it? My API is in C#.
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