Browsersync is running on port 3002 for you because something is already running on 3000
The proxyUrl isn’t currently able to detect when BS changes its port
Can you kill whatever is running on port 3000 and try again? fkill is good for this:
yarn global add fkill-cli
fkill :3000
Then try running yarn start again and seeing if it loads your BS session at http://localhost:3000 instead of http://localhost:3002