I just went to CT, I too have an "Unlimited" account, and found that when I went to my Coinbase API it had a red "Key Invalid". BUT, when I hit the "check now" button, it worked, and the Key invalid went away too.
Thanks, I wonder if they are having API issues, I was using another service and it keeps timing out to Coinbase.
Just tried again and still getting Key Invalid, which I know isn't the case. I wish there was more feedback. Frustrating to pay for it, and immediately run into an issue with a 5 day backlog on support.