Issue with Receiving Messages in Webhook after WhatsApp Embedded Signup

I am currently testing my web app in a local environment, and I have successfully implemented the WhatsApp embedded signup functionality. However, I am encountering an issue with receiving messages in the webhook after subscribing to it.
Here is a summary of the steps I've taken:
Implemented embedded signup successfully.
Obtained a code for generating an access_token using the "https://graph.facebook.com/v18.0/oauth/access_token" API.
Debugged the token and retrieved the waba_id using the "https://graph.facebook.com/v18.0/debug_token" API.
Obtained the phoneNumberId using the "https://graph.facebook.com/v18.0/:whatsapp-business-account-id/phone_numbers" API.
Registered the phone number using the "https://graph.facebook.com/v18.0/:phone_number_id/register" API.
After successfully subscribing to the webhook using the "https://graph.facebook.com/v18.0/:WABA_ID/subscribed_apps" API and receiving a positive response, I am not receiving any messages or data in the webhook when sending a message to the registered number.
If there are any additional steps or configurations needed to ensure the proper functioning of the webhook, please provide guidance.
Thank You.