Thank you for the very detailed explanation of your issue.
The 3 beeps/blinks are present when the system is not recognizing any RAM populated in the unit's DIMM slots.
If you have changed the RAM and you know it is working properly with another system, this could be a faulty DIMM slot.
RAM compatible types with this unit would be: DDR3L-1333/1600 1.35V SO-DIMM
After checking the RAM modules you added in your description, I found out they are compatible.
My recommendation would be to contact Intel Customer Support and request the warranty on your product, as per the information provided, the DIMM slots could be faulty.
It would be helpful if you add your explanation in the email or ticket you open (or explain that over the phone).