Weird. I qualify for the Legend "My Achievement" tier and only received 10msp. I guess it's because I'm not a gold member, currently? It's also my birthday month, and I see nothing for that.
Also, the survey isn't working for me, this month. I just get a message; "Thank you for your feedback. You will receive 20 Microsoft Points shortly. Watch for a new survey opportunity next month." And below this it says: Next Question.
Have the rules for rewards been adjusted? i.e. limited to gold members?