Symptoms

When trying to open something from k2 following error arises:
Claim mapping configuration cannot be found for this claim. Claim information: Name='devadmin@Environmentname.onmicrosoft.com', Issuer='trust.k2.com', Original Issuer='trust.k2.com'. Please ensure that you have configured the K2 server as specified in K2 Help: Installation and Configuration > Configuration > SharePoint > Claims-based Authentication.
 

Diagnoses

Tried this solution but did not work:
http://community.k2.com/t5/K2-blackpearl/Appit-Environment-Claims-mapping-configuration-cannot-be-found/ta-p/87901

 

Resolution

Logged into Firefox with multiple accounts on different environments. Solution was to log out, close browser and log in via a private window.