Make sure the plugs are in the receiver correctly. Have seen the power plug reversed a surprising number of times, which at least on some receivers causes a blinking light, sorta like a binding blink.

If the receiver model has a bind button, use it, not the bind plug.

Make sure all of the batteries are up, I’ve read reports of radios working fine at lower Voltages, but would not bind at the lower Voltage.

Some have reported binding issues if they hold the transmitter too close to the receiver.