I believe the Blueprint pipeline for this is broken.
If I create a Python script to call the render where I set the map of the job like this:
job = queue.allocate_new_job()
job.set_editor_property('map', unreal.SoftObjectPath(MAP_PATH))
job.set_editor_property('sequence', unreal.SoftObjectPath(LEVEL_SEQUENCE_PATH))
It works!
However, doing the same in Blueprints I continue to get the ‘No current map’ error.
Map path and Sequence path are the same for both Blueprints and Python versions, of course.
The complete error for the Blueprint version is:
Warning: Unable to start movie pipeline job. No current map.