Symptoms

WIF10201: No valid key mapping found for securityToken: 'System.IdentityModel.Tokens.X509SecurityToken' and issuer: 'https://ststest.CLIENTSSITE/adfs/services/trust'.

 

Diagnoses

After applying a rollup with new AD FS tokens, the error above occurs when going to Designer.

 

Resolution 

Updated the ADSFS thumbprint with the new thumbprint  in the ClaimsIssuer table of the K2 database to resolve the issue.