IFTT not interacting with HA issue [TTS] (Google Home intercom with IFTT)

Hello everyone! Thank you for your time with my issue. I am currently using this method to create an intercom system:
http://mypageaboutrandomstuff.blogspot.com/2017/01/google-home-intercom-using-hass-home.html

IFTT is able to receive the message from google assistant since the trigger is working; however, Home Assistant is unable to receive the command. If I were to manually call the service using /dev-service, it works completely fine.

I have been told cURL might help, but no one has been able to tell me what command would point me in the right direction.

Notes:
The Home Assistant url is externally accessible.
TTS through manual text input works fine.

IFTTT layout: [Make a web request]
URL: http://xxx.xxx.x.xxx:8123/api/services/tts/google_say
Method: POST
Content type: application/json
Body: {“entity_id”:“media_player.living_room_tv”,“message”:" {{TextField}}"}

Looking forward to your help!