Clear CCP user login cache (Mac)

We recently moved our FederatedID from dev to production, and I need to clear my login credentials/cache from the CCP.  I do a sign out and as expected the next time I launch CCP it prompts for the initial credentials and recognizes it needs to send me to our SSO portal, but it doesn't display the page for me to sign in on our side - just logs me in. I've rebooted and cleared the Safari cache, but it didn't help.  I tried launching CCP while holding down option... same results.