We have been fighting a leaky wall-hung toilet.

We mounted the bowl without the tank, and flushed it by dumping buckets of water. No leak visible.
So the outlet and wax seal are OK.

The trouble comes up when we put the tank on -- we cannot seem to eliminate incipient-to-deluge dampness. I visited American Standard's website. It is very difficult to implement their tighten-with-a-wrench suggestions, and I am afraid of breaking the bowl or tank.

It's difficult to firm up the two-point connection offered -- the tank currently does not rock from side to side, BUT I can pull it out toward the room, orthogonal to the line of bowl bolts. (Wrong tank for this bowl?)

I'm going to try American Standard's 800-number. If that bears no fruit, I'll have to break down and call a plumber...