Why is BeautifulSoup not working properly on Heroku server?

Question

Python

I am making a Telegram bot that should parse sporting events. There is this request:

today = str(datetime.today()).split()[0]
url = 'https://www.championat.com/stat/football/#' + today
headers = {
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36'}
r = requests.get(url, headers=headers)
html = BeautifulSoup(r.text, 'html.parser')
[s.extract() for s in html('script')]

Both locally and on the Heroku server everything works fine. Next, I want to take some blocks with BeautifulSoup:

tournaments = html.findAll("div", {"class": "seo-results__tournament"})
matches = html.find("div", {"class": "seo-results"}).findAll("ul")

Locally everything works fine, but when I upload the bot to Heroku it .findalways returns None. How can this be fixed?