If your GNSS module is not getting a fix, it is possible that the antenna is not correctly tuned. The first step to take is to review the matching circuit, checking it corresponds to the reference design in the datasheet. Once the module is connected, it should function even if it has no fix.
We recommend doing a quick query of satellites (SVs) with a carriter to noise ratio (C/N). The C/N density ratio is an important indicator of GNSS receiver performance. This will give you a good idea on how it is performing. When undertaking tests, do these outside and away from tall buildings – also ensure the antenna is pointed towards the sky.