Hey! I’ve been dealing with the same thing. The "why does Facebook keep saying session expired" problem is super common, apparently. I read somewhere that it could be due to Facebook’s servers being overloaded.
Try logging in during off-peak hours to see if that helps. If not, maybe contact Facebook support. They’re not the most helpful, but it’s worth a shot.
Try logging in during off-peak hours to see if that helps. If not, maybe contact Facebook support. They’re not the most helpful, but it’s worth a shot.