function-name allocation of dataset dataset-name failed; RTC=hex-return-code; RSC=hex-reason-code
Error message issued by VNCRXF22, the MBRLST function. The function attempted to dynamically allocate the dataset name specified in the function call, but received reason codes other than x’1708′ and x’6708,’ which indicate “not found”.
The return and reason codes are documented in in the IBM manual z/OS MVS Authorized Assembler Services Guide in the section Interpreting DYNALLOC Return Codes.