Bungie was recently having some issues with the tool they use to mass-grant these emblems, but they assured that all players who qualify have been processed. You can fill out the contact form in the following article for Bungie to look into it, but be aware that Bungie has gone on their holiday break and you probably won't hear back or receive the emblem until after the holidays. https://help.bungie.net/hc/en-us/articles/360049498731-Contact-Form-Missing-Destiny-2-Emblem