Why is my SSD not being recognized to boot up?

I recently upgraded my SSD and used an external card reader to install the new OS on it because my MacBook Pro was not detecting it. I tried a new SSD tray and still not reading it. What would be my next step? I connected the SSD to my other MacBook using an external reader and it works with no issues. Any help is greatly appreciated.

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What is the SSD and your OS version you are working from?


I am using a Samsung MZ-DPC768A-0A2 768GB SSD and currently using Catalina 10.15.5. It boots up perfectly if I use the SSD to USB reader but once it goes in the tray it won’t read it.


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