Removing the phone from the case, inserting the charger cable then reinserting the phone into the case worked for me. Bizarre but it worked. Samsung Galaxy S20.
I believe it's using NFC, so try to disable and re-activate it, remove and set up the cover again and if this only doesn't work.
Go to Settings -> Applications -> In the filter and sort options -> Show system apps
find "Led cover" then Storage, delete everything and try again, allow everything in security also.
In doubt, reboot.