'The remote endpoint returned an error (HTTP 404)

I'm getting this error while sending adaptive cards to outlook from my azure bot. I am trying to build an Outlook connector bot as explained herein MS Docs (link https://docs.microsoft.com/en-us/azure/bot-service/bot-service-channel-connect-actionable-email?view=azure-bot-service-4.0 here). I have also created an Azure Bot and have registered it with the channel on the registration page. However, I am not getting a response in the bot when the button is clicked. Wonder if there is a more step-by-step. I need help to know how I can connect (and verify) the action with my Bot.

"actions": [
                        {
                            "type": "Action.Http",
                            "title": "Submit",
                            "method": "POST",
                            "url": "https://5fd9-49-207-202-185.ngrok.io/api/email",
                            "body": "{Option: {{Options.value}}, SuggestionText: {{Suggestions.value}}}",
                            "isPrimary": true,
                            "style": "positive",
                            "headers": [
                                {
                                    "name": "Content-Type",
                                    "value": "application/json"
                                },
                                {
                                    "name": "Authorization",
                                    "value": ""
                                }
                            ]


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