Advice - Compressor Not Engaging

So in an effort to get my factory AC running again (only have the car <1y), I recently replaced a cracked condenser, replaced the oil w/ester, relevant seals along the way, dryer, and expansion valve.

The Issue:
Pulled a tight vacuum over 6 hours with no leaks. When turning to max ac, rpm drops about 50rpm, but the compressor does nothing. No clicks...completely silent.

Do you think it could be a compressor or electrical/switch issue? I tested the lead to the compressor and got zero volts, but not sure what I should get.

Just hoping for some other thoughts / ideas on where to troubleshoot next.