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The lockshield valve is probably closed, should be fairly simple to open it up with an adjustable wrench or even the plastic valve cap, provided the valve cap is not spinning freely

Also check that under the external window sill has been caulked too

Did you manage to sort this out? I had a similar problem for a new window, where the bottom of the frame bowed up, and although the locking pins were not hitting the frame, they sat too low to engage into the lock. The solution was to add a new fastener to pull the centre section of the bottom...