Folder Permissions Denied - Cant access External Hard Drive or SD card through Lightroom

Denied folder permissions are a MacOS thing, not something Lightroom does. You try to access a folder that Lightroom does not have the right to access. Contrary to popular belief, 'Full Disk Access' does not mean Lightroom has access to every folder on your disk. There are still folders, such as most system folders, Time Machine disk folders, and folders belonging to another user account, that will not be accessible. Without detailed information about the folder you try to access with Lightroom, nobody can tell you how to fix it (or if you should not try to fix it but choose another folder).