Perhaps gas is not entering the KEG? I don't seem to be losing much on the gauge.
I turned it up to 12/13 psi to see if it makes a difference.
If there is no surgar pitched into the keg, would it still carbonate slightly just based off of regular fermentation?
Another overlooked aspect other than the obvious leaking keg is the amount of headspace. Is your keg filled to the brim with little headspace for the C02? I noticed this myself a couple times. I burst carb my kegs at 40 psi for one day then back to 10 psi for another day or two to level out. This has worked well for me most of the times except a couple times when the beer still came out flat. Check what your beer level is and make sure you have enough head space for C02 to actually enter into the keg. If its full just pour a couple of flat pints to make room.
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