You at least need a wire from some GPIO pin on your Uno (usually D10) to the RESET of the Pro Micro. (the RESET on the ISP connector of the Uno does not do this and should NOT be connected to anything.)
You at least need a wire from some GPIO pin on your Uno (usually D10) to the RESET of the Pro Micro. (the RESET on the ISP connector of the Uno does not do this and should NOT be connected to anything.)