So from the sounds of it there is a problem between the service you are sending the webhook from and your n8n instance. Seeing you are using a Windows laptop, are you also using the n8n desktop app?
If so, could you confirm if your n8n webhook URL still matches what you have configured in your service sending the webhook? The desktop app uses a special tunnel to allow incoming webhooks (which would otherwise not be possible on most desktop computers) and the tunnel URL might have changed.
It’s also worth double-checking that your n8n desktop app hasn’t set up a broken URL, see this post for details: Connect n8n to webhook on desktop app - #2 by MutedJam