I qualified for the 300K threshold gift selection on Dec. 23/21 - I called in on Jan. 12th and Jan. 19th to inquire about how to choose my gift, I am still waiting on this.
My account was updated overnight and I qualified for the 300K and 350K, there was a tab to select the 300K gift which showed up in my account immediately after selected. Hopefully the tab will appear for the 350K.