So, this should definitely work for you. A few things to check:
You included the whole line. The "
apiKey:
" part is necessary. So you should have a whole line that looks like:apiKey: ffffffff-0000-0000-0000-ffffffffffff
It could be that there are connectivity issues. You're not behind a proxy or something are you? If you need to, you can specify the proxy as:
proxy: foo.com:8080