This might work but I’m not confident 
If you go to settings and disable “Automatically follow redirects”, then add this to the Tests:
const querystring = require('querystring');
let params = pm.response.headers.get('Location').split('?')
console.log(querystring.parse(`${_.last(params)}`).sssToken)
It’s probably not what you need as it wouldn’t complete the flow you need - I’m unsure have to get the headers from a redirected URL in an efficient way 