I have a garrison at my captial that is under supllied I checked I have enough to repsuplly it but my respupply units are sitting idle what do I do tofix that
1) you can manually instruct supply units to resupply by hitting deploy garrison (I believe) - in this case for your capitol..below is some ideas to keep this from happening.
2)make sure your supply units have enough supplies of their own.
3)make sure you have enough supply units. I'm using 1 per every 4 installations or military units as a rule of thumb. (bare bones minimum)
4)check and see if you are at war. That has an effect on what is serviced and when. Those units get easily confused in my experience.
5)as per 4 - they also service RDU's as well as units in the field. Make sure these are dismantled when no longer of service.
6) It also takes a tad bit of time for your orders to reach supply units. (give it a couple of game days to a game week. I haven't been watching this too closely since starting to put more supply units into the field.)