Jason - you ever find a way around this? We've been through a TAC case only to hit that this isn't exactly a supported option yet (if ever), even in the latest 11.5.2.
I just finished an upgrade from 8.6 to 9.1 for CUPS - seeing the exact same thing. The presence engine will start on the publisher but not on the subscriber. I'm scrambling to find a more useful error message than what RTMT is saying but I can't fi...