IP my Digital Ocean App

I required ip address of my server for MongoDB Atlas whitelist. I don’t see it in control panel.

I’ve tried:

1. Ping host on my pc and getting this ip.
2. By console on DO App control panel and python interpreter, like this:

from requests import get

ip = get('https://api.ipify.org').text
print('My public IP address is:', ip)

This 2 methods returns 2 differences ip address. Unfortunately, neither of them doesn’t work with Atlas MongoDB.

P.S. My app is in docker file.