Did I ever read that wrong. Its been a busy day.
Ignore that. I have several dozen agents registered on several test clusters already. They check in mostly fine after the 7.9.1 update. Check the bottom of this long post to clear it up. Basically it looks like there is a problem with the SIEM object missing as the clients are unable to pull the list down "even empty one" and I can not browse to it directly.
Which makes sense as to why I can't save the object as it doesn't actually exist. It was present in 7.9.0 but it's missing in 7.9.1. This is on several clusters. I'm honestly not sure how to even recreate it to be able to set the exemptions.