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You must remap the mytele_keyboard/cmd_vel topic to the cmd_vel_mux/input/teleop, same way keyboard_teleop.launch does. Change your launch file to something like:

<launch>
  <node pkg=“mytele” type=“mytele_keyboard” name=“mytele_keyboard” output=“screen”>
    <remap from="mytele_keyboard/cmd_vel" to="cmd_vel_mux/input/teleop"/>
  </node>
</launch>

If it doesn't work, your teleop cmd_vel topic name must be something different, so type

rostopic list -v | grep Twist

to list all velocity command topics and change the remap accordingly.