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Unless the SD card is using a Linux filesystem, you won't be able to use Linux access permissions.
Most SD cards are preformatted to FAT or exFAT in order to maximise compatibility. If you don't need to use the card on any non-linux devices you should be able to reformat it and gain the ability to chown/chmod (should go without saying, but back up any data on the card you want to keep before this)
There are other comments here which might have some relevance but imo this one is the most likely the most applicable. I've had this experience with other filesystems over and over and it seems like it's almost always a problem. Apparently NTFS supports permissions in a similar way to Linux if you set it up exactly right, but I've never taken the time to try that.