Getting Flask Error GET html 404 constantly

All of my .html files are present in templates folder.

I'm getting a 404 error on one particular file called tour.html

I have defined its route as:

@app.route('/tour1.html')
def tour1():
    return render_template('tour1.html')

Full Error is

"GET tour1.html HTTP/1.1" 404

Additionally, the linking works fine when I run on VS Code Live Server, so no issue in html files.