Thats not good @PikeBishop
When you applied the case does it invoke any relevant settings ?
As a process of elimination can you try your case on another phone ?
Can you try another case on your phone ?
Was the case supplied by Samsung ? i.e is it definitely an original ?
Unfortunately looking at results from a Google Search there does to be some inherent issues with this particular case !
I wish you all the best with this situation.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 2.5/ Android 10.