The SD card reader slot on the new 14 and 16-inch MacBook Pro models is not functioning as expected with some SD cards, according to multiple reports on the MacRumors forums. Same issues with 14" M1 ...

If your SD Card is not detected in the Device Manager, then this post will help you. This issue can occur due to hardware issues, outdated or corrupted drivers, faulty SD Card, faulty SD Card reader, ...