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<@U9N5J06UB> that error means you're not using the right WSDL for the account. are you trying to access SB or Prod?

Using SB, will try with the sandbox url, thanks !

Switching to "<https://webservices.sandbox.netsuite.com/wsdl/v2017_2_0/netsuite.wsdl>" did help, now I get "InvalidCredentialsFault: Could not determine customer compid"

I am using the right account credentials and admin role:
RecordRef ref = new RecordRef();
		ref.setInternalId("3");
		passport.setRole(ref);
Would you have an idea for this one ?

Are you sure you are setting the account id?

nlapiGetContext().getCompany() which is the account id with "_SB1" : passport.setAccount("1234567_SB1");