Guacamole Error: The remote desktop server is currently unreachable. If the problem persists, please notify your system administrator

I'm installing Apache Guacamole using DockerHub's Guacamole container on a macOS Big Sur laptop. From the terminal, I'm running this command:

docker run \
  -p 8080:8080 \
  -v :/config \
  oznu/guacamole

Then, I'm getting my IP's address by typing ipconfig getifaddr en0 in the terminal. With the IP's address & port 8080, I open my browser & navigate to <ip-address-here>:8080/#/ which takes me to the login screen.

From there, I do the following:

• Enter the Guacamole's default user which it's guacadmin (both username & password).
• Create a new user with admin's privileges.
• Delete the default user for security reasons.

Then, I create a new connection with the following parameters:

EDIT CONNECTION

• Name: <connection-name>
• Location: ROOT
• Protocol: VNC

Network

• Hostname: <ip-address-here>
• Port: 5900 (I think this is the default port for VNC's protocol)

Authentication

• Username: <machine-username-here>
• Password: <machine-password-here

I hit save & try to connect, but I get to this screen:

Note: I also enabled Remote Management on my Mac.

I solved the issue. Instead of enabling the Remote Management, I enabled VNC's server using this article.