Nil JW Token at /graphiql

Question

I`m trying to use JWT with Rails&GraphQL and set at http://localhost:3001/graphiql any query:

query {
  courses {
    edges {
      node {
        id
        title
      }
    }
  }
}

And I get from GraphQL message:

{
  "error": "Nil JSON web token"
}

In terminal i have message:

(called from include at /project-api/app/controllers/application_controller.rb:6)
Processing by GraphqlController#execute as */*
Parameters: {"query"=>"\nquery {\n  courses {\n    edges {\n      node {\n        id\n        title\n      }\n    }\n  }\n}", "variables"=>nil, "graphql"=>{"query"=>"\nquery {\n  courses {\n    edges {\n      node {\n        id\n        title\n      }\n    }\n  }\n}", "variables"=>nil}}
[active_model_serializers] Rendered ActiveModel::Serializer::Null with Hash (0.12ms)
Filter chain halted as :find_or_create_current_user rendered or redirected
Completed 401 Unauthorized in 11ms (Views: 8.4ms | ActiveRecord: 0.0ms)

Please tell me where can I start to solve this problem

P.S. The token is tracked successfully and it is valid