Since you are running it inside Vagrant, It probably edited Vagrants /etc/hosts instead of the mac’s
You can’t change the port, as the Dev Rig uses Twitch Auth. and the Auth uses a specific redirect URL that you can’t change.
Basically you are making it more complicated by running it inside vagrant as it’s not really “designed” for that.
You’d have to forward/open the port externally on vagrant and access the rig via that port. And your /etc/hosts on the mac (not in vagrant) would need a rule pointing the line to the vagrant IP instead of 127.0.0.1
So on the mac instead of
localhost.rig.twitch.tv 127.0.0.1
it would be
localhost.rig.twitch.tv 176.255.255.1
Or whatever vagrant raised up on…