Run the below cell before running your streamlit app on localrunnel
import urllib
print("Password/Enpoint IP for localtunnel is:",urllib.request.urlopen('https://ipv4.icanhazip.com').read().decode('utf8').strip("\n"))
This will give you the EnpointIP your Internet is running on. The copy that IP & paste it into the Friendly Reminder page.
Then you should be directed into your streamlit web app page.
This is a great way to test your web app before actual deployment. I hope that helps