Ecu not sending signal to spark plug harness?

[Amirkade]

So I have a no spark issue with my car, and I couldn’t find what it was, after doing some testing I’ve come to figure out possibly that my ignition coils aren’t grounding, what could it be? I use a test light on both of the terminals on the harness, they both get ground when the ignition is off, And they both get voltage when the ignition is on. But when I go to crank, the test light doesn’t blink, indicating that it is not forcing ground when that cylinder is ready to spark. does anyone have any information for this to help me out? Did I do the test incorrectly? or does it simply not work that way?

[RX400h]

Here's a guide to properly checking ignition coils:

How To Test a Lexus IS300 Ignition Coil - My Pro Street (prostreetonline.com)