Hi Peter
For WSXXXX did you check the Properties for Linkage Status to be "No Errors" and "Linkage Status activated"?
Did you make any changes to WF-Batch, WF config (that I mentioned), etc since raising this post? If so, try to trigger another WF request
Does the Approver and WF-Batch Accounts have a valid email address in SU01 (assume it will or I think it shows on MSMP instance runtime)
Do you have configuration parameter 3022 set for Request Type for Role Approval (should be value 21 I assume)
I can't check DISPLAY_APP method but possibly someone else might be able to check their system.
Regards
Colleen