Running docker compose states port already in use, but port scan on Network Utility shows nothing running on port

I’m attempting to follow this tutorial: https://pawelgrzybek.com/configure-a-local-wordpress-development-using-docker/

After setting everything up, trying to run the container I get a failure for wp_wordpress_1 where I get the following error:

ERROR: for wordpress Cannot start service wordpress: Ports are not available: listen tcp 0.0.0.0:80: bind: address already in use

I’ve killed all Docker containers, and have gone into the Mac Network Utility to run a port scan for 0.0.0.0:80 but it seems like there is no utility using this port, but yet I still cannot run the docker build.

Source: StackOverflow