For sure FIRSTNAME2 and LASTNAME2 will not work. Please change the PSD to FIRSTNAME and LASTNAME and trry again.
Let me know if that works.
If it doesn’t work then there is another issue. However, we first need to test with the correct names now that you have it loading the CSV finally.
I tested on Windows. Mac should work the same. Please let me know after testing the fixed PSD. If it doesn’t work with the correct layer names then we will go to the next troubleshooting step. However, I think it will work.