Line Bot でステータスコード200なのに、返信が来ない

Question

おうむ返しbotを作りたい

現状、ターミナルにリクエストがちゃんと来ていて、client.reply_message(event['replyToken'], message)以外の部分で特に問題はなさそうです。
なぜ、client.reply_message(event['replyToken'], message)が動かないのか、ご教授ください。

# ngrok 側のターミナル

ngrok by @inconshreveable                                                                (Ctrl+C to quit)
                                                                                                         
Session Status                online                                                                     
Session Expires               1 hour, 23 minutes                                                         
Version                       2.3.40                                                                     
Region                        United States (us)                                                         
Web Interface                 http://127.0.0.1:4040                                                      
Forwarding                    http://3014-60-125-209-90.ngrok.io -> http://localhost:3000                
Forwarding                    https://3014-60-125-209-90.ngrok.io -> http://localhost:3000               
                                                                                                         
Connections                   ttl     opn     rt1     rt5     p50     p90                                
                              8       0       0.00    0.00    20.30   20.46                              
                                                                                                         
HTTP Requests                                                                                            
-------------                                                                                            
                                                                                                         
POST /callback                 200 OK                                                                    
POST /callback                 200 OK                                                                    
POST /callback                 200 OK                                                                    
POST /callback                 200 OK                                                                    
POST /callback                 200 OK                                                                    
POST /callback                 200 OK                                                                    
POST /callback                 200 OK                                                                    
POST /callback                 200 OK             

# rails サーバー側のターミナル


Started GET "/" for ::1 at 2021-10-15 14:28:38 +0900
   (0.0ms)  SELECT sqlite_version(*)
Processing by HelloController#index as HTML
  Rendering hello/index.html.erb within layouts/application
  Rendered hello/index.html.erb within layouts/application (Duration: 1.4ms | Allocations: 186)
[Webpacker] Everything's up-to-date. Nothing to do
Completed 200 OK in 35ms (Views: 30.9ms | ActiveRecord: 0.0ms | Allocations: 8304)


Started POST "/callback" for 147.92.149.165 at 2021-10-15 14:33:15 +0900
Cannot render console from 147.92.149.165! Allowed networks: 127.0.0.0/127.255.255.255, ::1
Processing by LineBotController#callback as HTML
  Parameters: {"destination"=>"U2ddd1dbbf3e4674173ab1bf56bbf689c", "events"=>[{"type"=>"message", "message"=>{"type"=>"text", "id"=>"14916580578592", "text"=>"らならな"}, "timestamp"=>1634275994351, "source"=>{"type"=>"user", "userId"=>"Ucf3253cdda0ab9f615c390fddc69af71"}, "replyToken"=>"3ccbae4f2b584d6489b1e788f4897549", "mode"=>"active"}], "line_bot"=>{"destination"=>"U2ddd1dbbf3e4674173ab1bf56bbf689c", "events"=>[{"type"=>"message", "message"=>{"type"=>"text", "id"=>"14916580578592", "text"=>"らならな"}, "timestamp"=>1634275994351, "source"=>{"type"=>"user", "userId"=>"Ucf3253cdda0ab9f615c390fddc69af71"}, "replyToken"=>"3ccbae4f2b584d6489b1e788f4897549", "mode"=>"active"}]}}
Completed 200 OK in 65ms (ActiveRecord: 0.0ms | Allocations: 1110)

class LineBotController < ApplicationController
  protect_from_forgery except: [:callback]

  def callback
    body = request.body.read
    signature = request.env['HTTP_X_LINE_SIGNATURE']
    unless client.validate_signature(body, signature)
      return head :bad_request
    end
    events = client.parse_events_from(body)
    events.each do |event|
      case event
      when Line::Bot::Event::Message
        case event.type
        when Line::Bot::Event::MessageType::Text
          message = {
            type: 'text',
            text: event.message['text']
          }
          client.reply_message(event['replyToken'], message)
        end
      end
    end
    head :ok
  end

  private
    def client
      @client ||= Line::Bot::Client.new { |config|
        config.channel_secret = ENV["LINE_CHANNEL_SECRET"]
        config.channel_token = ENV["LINE_CHANNEL_TOKEN"]
      }
    end
end

解決するために実行したこと

• チャネルトークンとチャネルシークレットキーを確認。
• チャネル側の登録ドメインを切り替え、再接続
• event['replyToken']のアクセスできているか、pp event['replyToken']でターミナルに出力させて確認。

class LineBotController < ApplicationController
  .
  .
  def callback
    .
    .
    .
        when Line::Bot::Event::MessageType::Text
          message = {
            type: 'text',
            text: event.message['text']
          }
          client.reply_message(event['replyToken'], message)
          pp event['replyToken']
          pp message
        end
      end
    end
    head :ok
  end
.
.
.
.

end

Started POST "/callback" for 147.92.149.165 at 2021-10-15 15:01:26 +0900
Cannot render console from 147.92.149.165! Allowed networks: 127.0.0.0/127.255.255.255, ::1
   (0.1ms)  SELECT sqlite_version(*)
Processing by LineBotController#callback as HTML
  Parameters: {"destination"=>"U2ddd1dbbf3e4674173ab1bf56bbf689c", "events"=>[{"type"=>"message", "message"=>{"type"=>"text", "id"=>"14916696216493", "text"=>"たやたや"}, "timestamp"=>1634277685467, "source"=>{"type"=>"user", "userId"=>"Ucf3253cdda0ab9f615c390fddc69af71"}, "replyToken"=>"e650a69c228445d78f96089f6719aa7e", "mode"=>"active"}], "line_bot"=>{"destination"=>"U2ddd1dbbf3e4674173ab1bf56bbf689c", "events"=>[{"type"=>"message", "message"=>{"type"=>"text", "id"=>"14916696216493", "text"=>"たやたや"}, "timestamp"=>1634277685467, "source"=>{"type"=>"user", "userId"=>"Ucf3253cdda0ab9f615c390fddc69af71"}, "replyToken"=>"e650a69c228445d78f96089f6719aa7e", "mode"=>"active"}]}}
"e650a69c228445d78f96089f6719aa7e"
{:type=>"text", :text=>"たやたや"}
Completed 200 OK in 86ms (ActiveRecord: 0.0ms | Allocations: 1215)

個人的な結論

line側の問題なのかなと考えています。
原因をご教授していただける方はお願いいたします。