You can tell if the starter is working based on whether or not the motor cranks over.
I’m guessing if you put the key in the ignition and turn it, lights dim, but nothing happens?
Rotaries are just like piston motors to this point. They still need power to the starter motor.
It’s when they do run, sort of, only badly and rich/oily that they start being rotaries.
Check for voltage at the starter.
It could be (in order of likelihood)
Fuse (starter)
Bad wiring/connections to the starter
bad starter
If there is 12+v at the starter when you crank it, the starter is boinked.
Pull it out, and bench test it. There are 3 posts on the starter (most of them) I haven’t had an FC starter in my hands for a few years, so I can’t remember off hand.
Typically there’s 3, one for 12v, one to bridge 12v and one ground.
One 12v fires out the bendix, the other makes it spin.