Hidden field help

I am trying to add a hidden field to a form that will simply add the word “subscribe” to the form results that we receive via email. Based on reading previous discussions and documentation, i’ve added the following to the form:
[hidden text-hidden "subscribe"]

So the form looks like this:
Full Name (required) [text* your-name]
Email (required) [email* your-email]
Organization (required) [text* your-org]
[hidden text-hidden "subscribe"]
[submit "Send"]

I then add [text-hidden] to the message body in the “Mail” setting in Contact Form 7 so it looks like this:

From: [your-name]
Email: <[your-email]>
Organization: [your-org]
[text-hidden]

However, when the form is submitted, I receive an email but the email does not show the word “subscribe”. Other fields are passing properly.

What am I doing wrong? Thank you!

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