I am using an Android phone, trying both the Samsung and Chrome browsers, but I can not use my time travel tickets.  I have purchased 3 time travel tickets in trying to get it to work for one day in February.  I have gone to the Problems page, clicked on the missed day in this month's calendar, and submitted the code.  After the submit was accepted, no pop-up appeared anywhere on the page asking about using a time travel ticket.  I followed the leetcode directions for "make up" but it still didn't time travel, and the calendar still shows the problem as not completed for the monthly challenge.