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。

zsh
1# ngrok 側のターミナル
2
3ngrok by @inconshreveable                                                                (Ctrl+C to quit)
4                                                                                                         
5Session Status                online                                                                     
6Session Expires               1 hour, 23 minutes                                                         
7Version                       2.3.40                                                                     
8Region                        United States (us)                                                         
9Web Interface                 http://127.0.0.1:4040                                                      
10Forwarding                    http://3014-60-125-209-90.ngrok.io -> http://localhost:3000                
11Forwarding                    https://3014-60-125-209-90.ngrok.io -> http://localhost:3000               
12                                                                                                         
13Connections                   ttl     opn     rt1     rt5     p50     p90                                
14                              8       0       0.00    0.00    20.30   20.46                              
15                                                                                                         
16HTTP Requests                                                                                            
17-------------                                                                                            
18                                                                                                         
19POST /callback                 200 OK                                                                    
20POST /callback                 200 OK                                                                    
21POST /callback                 200 OK                                                                    
22POST /callback                 200 OK                                                                    
23POST /callback                 200 OK                                                                    
24POST /callback                 200 OK                                                                    
25POST /callback                 200 OK                                                                    
26POST /callback                 200 OK

zsh
1# rails サーバー側のターミナル
2
3
4Started GET "/" for ::1 at 2021-10-15 14:28:38 +0900
5   (0.0ms)  SELECT sqlite_version(*)
6Processing by HelloController#index as HTML
7  Rendering hello/index.html.erb within layouts/application
8  Rendered hello/index.html.erb within layouts/application (Duration: 1.4ms | Allocations: 186)
9[Webpacker] Everything's up-to-date. Nothing to do
10Completed 200 OK in 35ms (Views: 30.9ms | ActiveRecord: 0.0ms | Allocations: 8304)
11
12
13Started POST "/callback" for 147.92.149.165 at 2021-10-15 14:33:15 +0900
14Cannot render console from 147.92.149.165! Allowed networks: 127.0.0.0/127.255.255.255, ::1
15Processing by LineBotController#callback as HTML
16  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"}]}}
17Completed 200 OK in 65ms (ActiveRecord: 0.0ms | Allocations: 1110)

rb
1class LineBotController < ApplicationController
2  protect_from_forgery except: [:callback]
3
4  def callback
5    body = request.body.read
6    signature = request.env['HTTP_X_LINE_SIGNATURE']
7    unless client.validate_signature(body, signature)
8      return head :bad_request
9    end
10    events = client.parse_events_from(body)
11    events.each do |event|
12      case event
13      when Line::Bot::Event::Message
14        case event.type
15        when Line::Bot::Event::MessageType::Text
16          message = {
17            type: 'text',
18            text: event.message['text']
19          }
20          client.reply_message(event['replyToken'], message)
21        end
22      end
23    end
24    head :ok
25  end
26
27  private
28    def client
29      @client ||= Line::Bot::Client.new { |config|
30        config.channel_secret = ENV["LINE_CHANNEL_SECRET"]
31        config.channel_token = ENV["LINE_CHANNEL_TOKEN"]
32      }
33    end
34end

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。

rb
1class LineBotController < ApplicationController
2  .
3  .
4  def callback
5    .
6    .
7    .
8        when Line::Bot::Event::MessageType::Text
9          message = {
10            type: 'text',
11            text: event.message['text']
12          }
13          client.reply_message(event['replyToken'], message)
14          pp event['replyToken']
15          pp message
16        end
17      end
18    end
19    head :ok
20  end
21.
22.
23.
24.
25
26end

zsh
1Started POST "/callback" for 147.92.149.165 at 2021-10-15 15:01:26 +0900
2Cannot render console from 147.92.149.165! Allowed networks: 127.0.0.0/127.255.255.255, ::1
3   (0.1ms)  SELECT sqlite_version(*)
4Processing by LineBotController#callback as HTML
5  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"}]}}
6"e650a69c228445d78f96089f6719aa7e"
7{:type=>"text", :text=>"たやたや"}
8Completed 200 OK in 86ms (ActiveRecord: 0.0ms | Allocations: 1215)