Key Vault and Azure Table Storage Retrieve -

when doing simple retrieve table storage seeking out encrypted data set, following error: error occurred while decoding oaep padding have created key , got key id through azure powershell. ms tutorial on works, if update , retrieve in same method call. when called individually through seperate posts/gets, above error.

i'm pulling hair on 1 , starting suspect bug within azure/table storage/keyvault (encryption). appreciate if knows this.

            rsakey key = new rsakey("mykeyid");          tablerequestoptions retrieveoptions = new tablerequestoptions()         {             encryptionpolicy = new tableencryptionpolicy(key, null)         };          tableoperation operation = tableoperation.retrieve(patientid.toupper(), questionnaireid.toupper());         var answers = answerstable.execute(operation, retrieveoptions, null);