At startup of CA Dispatch, the IKJ56228I message is issued because the Bundle Recovery dataset does not exist. You need to go to the VSGMU110 screen and define a valid Bundle Recovery DSN Prefix.
Specify values on the VSGMU110 screen (option 9.1 from the main menu) for the following fields:
Bundle Recovery DSN Prefix ==> ????.????.???? Unit ==> ?????
Volser ==> ??????
Make sure that the DSN PREFIX that is specified has the necessary security authorizations to be dynamically allocated and deleted by the USERID assigned to the CA Dispatch started task.