How to send html code via zapier webhook

Hello Guys,
Kindly help me with this. I am trying to send a html code in json payload using zapier webhook. I recreated the same request in postman and it is showing 200 status, but when i try to send the same payload yes it does have some dynamic content in it but it does not exceed any limitation. The image below is the sample:

As you can see it is successfully sent in postman
But in zapier it is giving me errors


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