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I want to mount a folder in a remote location to /mnt/volume on my mac but this folder is usually accessed through a login server myname@server-login.com using SSH like ssh -A -Y -o myname@server-login.com (the -A is necessary as it uses the same SSH key for subsequent hops) and then once on this server I do ssh -A -Y -o myname@server-main.com. I want to mount a folder in this server-main to my mac. How do I do this?

I have verified I can mount a folder on the server-login like so:
sudo sshfs -o allow_other,defer_permissions,IdentityFile=~/.ssh/id_rsa myname@server-login.com:/home/users/myname /mnt/volume
So my sshfs is working.

I tried this method https://www.larkinweb.co.uk/computing/mounting_file_systems_over_two_ssh_hops.html
Where I did ssh -f myname@server-login.com -L 2223:server-main.com:22 -N
and then sudo sshfs -p 2223 myname@server-main.com:/ /mnt/volume
But it comes back with remote host has disconnected.

In the article you are quoting there are two commands. The first,

$ ssh -f userB@systemB -L 2222:systemC:22 -N

establishes a tunnel between the local host and systemB; requests made to localhost:2222 are forwarded to port 22 on systemC.

Hence, to mount the /remote/path/ (that sits on systemC) on localhost you have to connect to localhost:2222, as in the second command:

$ sshfs -p 2222 userC@localhost:/remote/path/ /mnt/localpath/

But in your question you are trying to connect to systemC:2223.

It should be, instead:

$ ssh -f myname@server-login.com -L 2223:server-main.com:22 -N
$ sudo sshfs -p 2223 myname@localhost:/ /mnt/volume