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Microsoft Graph API - mail.send is not accepting HTML/ CSS code

I have copied the (html)source code from a recieved email just to have the template/format of that email, and this is the error message that i am recieveing when running the API:

Internal : Unexpected error Error during Web API HTTP Request

HTTP Status Code: 400 HTTP Response Content: { "error": { "code": "BadRequest", "message": "Unable to read JSON request payload. Please ensure Content-Type header is set and payload is of valid JSON format.", "innerError": { "date": "2020-12-02T17:01:05", "request-id": "3ab50fc1-0c13-4536-96db-bf6b9b7a736d", "client-request-id": "3ab50fc1-0c13-4536-96db-bf6b9b7a736d" } } }

I have tested basic commands using HTML such as making text bold and line breaks which work, but anything more complex and i will receive an error.

Help would be greatly appreciated.

Thank you

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