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The SSD is not seeing in the BIOS or in Windows?
By any chance do you have the M.2 model number?
Have you tried testing the SSD in another system if it is possible?
Did the unit work before and then failed or it never worked?
Please try accessing the BIOS by pressing F2 on your keyboard while the system is booting, click on advance, then click devices, select SATA, you will see an option that it says hard disk pre-delay, you will see a cero, try to put in 5 or 10 to then press F10 to save the changes.
Your system will restart so you can check SSD is recognized.
Please let me know if this information can help you.