Thanks. It solves the problem. I appreciate your quick response.
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This reply was modified 2 years, 1 month ago by pcskull.
Thanks for your kind reply and this awesome plugin. The issue is resolved. There was some encoding issue. And sorry for using this space to ask the question. Marking this as resolved.
But the same Newsletter form code work if I add it to the blog post and not when adding it to the pop-up.