Hi there,
On digging in to your account, I see that your domain default is set to your Branded Short Domain, q.blackbox.cool. That means that you can omit the domain parameter from the query and it will default to your BSD. Give that a try and see if it works for you as a workaround.
Aside from the above workaround, please write in to us at api -at-
bitly.com and we can work together to sort out what's going on with your use of domain. The INVALID_ARG_DOMAIN error does usually mean something is wrong with your domain, but your call as written below looks like it should work.
Regards,
---Peter
Peter Herndon
Sr. Application Engineer
@Bitly