Please consider adding a list of what features made the Align Parcel tool fail or clarifying the language in the error message. I have run into this issue multiple times where I'm running Repair Geometry on every single feature class and wasting a good amount of my time on what feels like a wild goose chase to figure out what made the tool fail.
I've been working on figuring out what made Align Parcel fail all morning and it's still failing after this last round of running Repair Geometry on the parcel fabric feature classes in my display. Put simply - I should not have to start from scratch every time there is a rogue null Z value somewhere that I simply cannot find or does not exist. The error message gives me no hints to where this null Z value exists, if it exists, why the Repair Geometry tool could not find & fix it, or what index it's referring to.
This vagueness is intensely frustrating and desperately needs to be rectified. I entered this subdivision from scratch as the CAD sketch provided by the developer was corrupted, and now it appears that those hours of work was for nothing.