Arduino Starter kit rfid module

Hello so I recently dived into arduino and I bought 3 starter kits, each of this starter kits have a RFID module with a tag and a card I tried cloning one of them in another and it didn't work, I was wondering if you could give your opinion, because after a deeper look into this topic I found out that only some Chinese tags can have their UID changed. I used the MFRC522 library and I can read them and also my phone is able to write text and paste links though its nfc functions, but I can't change the UID.

that's how it is

Isn't the basic idea that a UID is Unique? And that therefore, copying is not really an option???
These tags are used as keys. The idea is that each key has a unique ID. Therefore, you can log who comes in and who comes out. If someone left the company without returning his/her keys, you remove the key UID from the list of keys allowed to open the lock. All of this would not work if you can copy the UID into another key (basically duplicate a key).

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