Originally Posted by sdsearch

You very well may have. Technically, a conversion by Citi to an Plat MC is an "open" of an Plat MC, and the rules say you can't get the bonus if you had an Plat MC "opened or closed in the past 18 months" you are ruled out for the bonus.

That's why for months I've been recommending in this thread that anyone who still had a Visa or Amex cancel it ASAP, to avoid the risk of the situation you just found yourself in.

I don't think we have enough datapoints on people who tried to apply right after getting auto-converted from Visa to MC to know for sure. Wanna be our guinea pig?