The encryption key for was not populated during login" error thrown when executing a process that requires access to the Secure Credentials Store

Question

@ Nick Vigilante 
 Getting an error while trying to use third party credentials, even the KB - 1216 mentioned below is not helping: 
 com.appiancorp.suiteapi.common.exceptions.AppianException: An error occurred while accessing the per-user credentials from the Secure Credentials Store. The encryption key for <USER NAME> was not populated during login. See the documentation for proper configuration when using a custom authentication provider. (APNX-1-4221-001) 
 https://community.appian.com/support/w/kb/431/kb-1216-the-encryption-key-for-appian_5f00_user-was-not-populated-during-login-error-thrown-when-executing-a-process-that-requires-access-to-the-secure-credentials-store

aloks0189 · Answer

Hi @ketanpatel did you add this smart Service under plugins section of Third party credentials which you are passing as an input to this smart Service to access the details? 
 
If no, the you have to do this, and what about usePerUser, did you set it to false.

If all good, then I suspect, there might be something wrong in java code, which is responsible to fetch the details from Third party credentials. 
 
Can you try inspecting above mentioned points, it might help you

The encryption key for <APPIAN_USER> was not populated during login" error thrown when executing a process that requires access to the Secure Credentials Store