When Invoking A Workflow In PiP Session, Error "Child job stopped with unexpected exit code 0xFFFFFFFF" Occurs

How to resolve the error that occurs when trying to Invoke a workflow in PiP session, error " Child job stopped with unexpected exit code 0xFFFFFFFF " ?

How the User Service is started, with or without elevated rights matters the functioning of invocation of workflow.

As an example, if opening Studio as Administrator, creating a workflow with the isolated invoke and then started, the isolated workflow (executor) will not connect to the user service, because one is elevated (the user service) and the other isn't.

Resolution: Changing the compatibility setting for uipath.service.host.exe to non-admin, it allows sub-processes to be run through invoke.