Bench testing a 24v transformer

[Trapper]

What does your pilot flame look like? It should be a strong(not necessarily big) flame directed towards the thermocouple. If it’s a lazy, candeling flame that may be a problem. Shoot a burst of compressed air down the pilot hood where the flame begins. You can dislodge some debris and usually get a much better flame. I often will rap on the pilot assembly with a small wrench and that will sometimes be all it needs.

It was a bad solenoid in the gas valve, as soon as you let off the pilot went off and I had replaced the thermocouple that wasn't needed.
Replaced the gas valve and everything is working as expected.