Works now. Not sure what happened.

When I try to link my Steam account, Chrome opens a new tab that says:

{"requestId":"926e2227-6070-4aad-9aa6-ff0500971f53","errors":[{"status":"500","title":"java.lang.IllegalArgumentException","detail":"Steam redirect could not be validated! Original response:\n\u001F�\b\u0000\u0000\u0000\u0000\u0000\u0000\u0003\u0003\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000"}]}

My Profile and Games are set to Public.