Sync Error: INVALID_SESSION_ID: This session is not valid for use with the API

[Raghav]

Problem: When executing the Manual sync in zuora customer received below error 

This session is not valid for use with the APIAxisFault
 faultCode: {urn:fault.partner.soap.sforce.com}INVALID_SESSION_ID
 faultSubcode: 
 faultString: INVALID_SESSION_ID: This session is not valid for use with the API
 faultActor: 
 faultNode: 
 faultDetail: 
 {urn:fault.partner.soap.sforce.com}UnexpectedErrorFault:INVALID_SESSION_IDThis session is not valid for use with the API

INVALID_SESSION_ID: This session 

Solution: This issue was resolved by adding the Username Password to session security levels. 

To change the security level Please follow the below steps.

1. From Setup, enter Session Settings in the Quick Find box, then select Session Settings.
2. Under Session Security Levels, select the Username Password.