There is a major issue with this feature. We had two members use it and the mercenary units they were trying to distribute to their armies vanished, but the mercenary points were still used up. They both had to wait over a week for this to be fixed by support.
We just had a third member use this feature, and all of his range units vanished. This is a major issue and the developers need to get this fixed.

Also, I'm trying to find out if others have had issues with this.