TiggyTheTerrible
Have you ever tried it without a screen protector? If that works, it might be worth trying out a different screen protector.
I've been using Spigen Glas.tR EZ Fit for years and have never had any problems* with it (did'nt even have to enable screen protector mode).
*small caveat: I've been using the privacy screen protector of their line-up for some time now, and the fingerprint sensor sometimes doesn't work quite as well as with their non-privacy screen protectors.