I have same issue but my issue still persists even if i changed the XA name to DSN name. Any help here.
Micro Focus ESMVS/TSO Version 7.0.000. Copyright (C) Micro Focus 1997-2021. All rights reserved.
RUN PROGRAM(PGM1) PLAN(PGM1G)
MVSER0031S "ABC1" is not a valid subsystem id. Sub-command stream flushed.:
MVSER0099S Remainder of command stream flushed.:
Note: My XA source name is as same as DSN system i.e ABC1