When following the Salesforce intergration documentation (see link below) the Salesforce instance in the K2 Management Features is unavailable as per the document instructions.

Salesforce Intergration:

https://help.k2.com/onlinehelp/k2cloud/userguide/update_3/default.htm?utm_campaign=SC_Email_2018-03-08_K2-Cloud-Customer-Bulletin-Update-3App&utm_medium=email&utm_source=Eloqua#K2_Management_Site/Features/Salesforce.htm%3FTocPath%3DAdminister%7CK2%2520Management%7CFeatures%7C_____2

The error will be similar to the image below:

Resolution:  This feature is unavailable on K2 Cloud update 1. Upgrading to K2 Cloud update 2 will enable the feature and it will be ready for integration