The cache is not at the given coordinates.
If you have completed the Adventure Cache series with the same name, you will have the coordinates for this cache. If you have not done this Adventure Caches series, you will need to complete the series before you get the coordinates.
If you did not see the coordinates when you completed the Adventure Lab series, go to the last journal entry for the series and you should see the coordinates.
You can validate your puzzle solution with certitude.