What are the next steps in debugging a port not opening in ubuntu?

I'm attempting to open port 5555 on an ovh host in order to access a docker container, containing an API. The docker container is launched via ci/cd on github actions, which works appropriately.

Here are some relevant pictures:

Dockerfile:

FROM python:3.10-slim

WORKDIR /code
COPY . /code/

EXPOSE 5555

RUN pip install -r requirements.txt
CMD ["uvicorn", "api.app:app", "--host", "0.0.0.0", "--port", "5555"] 

Docker-compose file:

version: '3'

services:
  api:
    build:
      context: .
      dockerfile: Dockerfile
    image: 117hd-api:latest
    ports:
      - "5555:5555"
    env_file:
      - .env
    volumes:
      - /home/ubuntu/117HD-API/logs:/code/logs:rw

Verifying that the container is presently running

ubuntu@vps-177e15a2:/etc/ufw$ sudo docker container ls
CONTAINER ID   IMAGE              COMMAND                  CREATED       STATUS       PORTS                                       NAMES
ffacfd5e690d   117hd-api:latest   "uvicorn api.app:app…"   4 hours ago   Up 4 hours   0.0.0.0:5555->5555/tcp, :::5555->5555/tcp   117hd-api_api_1

Verifying that the firewall rules have been met

To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       Anywhere
80/tcp                     ALLOW       Anywhere
443                        ALLOW       Anywhere
8080                       ALLOW       Anywhere
2022                       ALLOW       Anywhere
3306                       ALLOW       Anywhere
6379                       ALLOW       Anywhere
5555                       ALLOW       Anywhere
22                         ALLOW       Anywhere
22/tcp (v6)                ALLOW       Anywhere (v6)
80/tcp (v6)                ALLOW       Anywhere (v6)
443 (v6)                   ALLOW       Anywhere (v6)
8080 (v6)                  ALLOW       Anywhere (v6)
2022 (v6)                  ALLOW       Anywhere (v6)
3306 (v6)                  ALLOW       Anywhere (v6)
6379 (v6)                  ALLOW       Anywhere (v6)
5555 (v6)                  ALLOW       Anywhere (v6)
22 (v6)                    ALLOW       Anywhere (v6)

I have also done sudo ufw reload, sudo ufw enable after this step, and I have rebooted the system as well -- to confirm.

I have also verified that accessing the docker container from localhost:5555 works as well. This was checked with ssh -L 5555:localhost:5555 ubuntu@##.##.###.###.

Externally pinging the port does not seem to work appropriately:

Pinging another port, used by redis, works as intended:

Any next help steps would be excellent. Thank you.