Getting error 403 on GET task

Hello. I am using an account with associated token to create and read tasks. I created a tasks successfully. Then I want to read read it and I’m getting error 403 - I am using the same credentials to get the task as I used to create it. What can be an issue? Tried both in C# code and in online tool in docs: Get a task?

Response I am getting:

{
  "errors": [
    {
      "message": "You do not have access to this task.",
      "help": "For more information on API status codes and how to handle them, read the docs on errors: https://asana.com/developers/documentation/getting-started/errors"
    }
  ]
}

What can be an issue? Changing private/public doesn’t change anything.

Apparently there was some long freeze in API services. Now I can see that the account has to be either a collaborator or the task has to be public. Started to work.