A few assumptions:
-You are using the same userid/account in both cases.
-You have no pre-assigned libraries.
If this is the case, EG will assign metadata libname when you try to access data.
In DI Studio by contrast, the generated SAS code will contain old school libnames, which does not take metadata authorization into account, just OS privileges.
Talk to the person responsible for administrating your SAS configuration/security/environment, or look for yourself in SMC to find out how to set appropriate authorizations.