Lens cover fell off

Hi, I have a ring floodlight pro and noticed when not light outside, or when the floodlight is on, night vision is covered in dots like water stains. On closer inspection I noticed the lens cover is flapping off , I touched it and it fell off all together. How do I go about replacing this ? Do ring sell official self adhesive covers or will they suggest it's out of warranty and nothing I can do about it ? Does it 'need' the cover even ? I noticed it looks polorised so wandering if it helps with lens flair or something?