Watchband repair?
1) Use a strong magnifying lass or jewelers loupe to inspect the holes in the case to make sure there’s no gunk or whatnot filling in one or both holes and preventing the springbar from seating securely. 2) Make sure you are using the proper length springbar (have a real watch repair shop size it.) 3) If that doesn’t do it I’d guess JekPorkins has it: the watch case was not manufactured correctly and the hole isn’t deep enough to seat the springbar properly. If you can’t get the watch replaced, it’s possible a jeweler could enlarge the offending hole.
You could deepen the hole using a pin vise and a small drill, but unless you have experience doing that, I don’t recommend you try. Drilling stainless steel is not like drilling most other metals, and the drill you’d be using is so thin that it’d be easy to snap. If you had a snapped-off drill bit embedded in the hole, all hope of getting a free replacement watch would be gone. Ask your jeweler if the hole is clear, or if it’s too shallow. If it’s too shallow, try to get a replacement watch.
the Swiss Army Watch 3 Year Warranty is here. Should be a free fix with $10 shipping and handling.