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Venkateswarlu BVenkateswarlu B 

Getting "INSUFFICIENT_ACCESS_ON_CROSS_REFERENCE_ENTITY, insufficient access rights on object id" when deploying case emailservice classclass into production when running test class.It is passed in all sandboxes but getting error in Production environment?

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Rahul KumarRahul Kumar (Salesforce Developers) 
Hi venkateswarlu,

may I suggest you Please refer the below link for reference. Hope it will be helpful.

Please mark it as best answer if the information is that question is removed from an unanswered question and appear as a proper solution.

Rahul Kumar
Hi Venkat,

Please check the case permission for the user running test classes and if you are creating new user within Test class. Then create with Admin access or some profile having Case access on it.