Originally Posted by WineCountryUA

Day of travel rerouting might be eligible for original routing credit. However, if an non-016 ticket, UA has no visibility to earning unless the *A carrier reports the flight. There have been rare success reports but in general this is a non-covered event unless the *A carrier acknowledges to UA the rerouting.

Having actually flown EK, you should be able to get credit from EK (but not to UA MP).