We had this problem for our May 4 sailing for one of us. After 4 tries and several calls with 30-45 minute hold times, Celebrity finally accepted the card upload for J&J Vax. Pfizer was accepted on the first try. Not sure if the fact that J&J was a one shot (vs 2 for Pfizer) was a problem or something else. Was unable to get an answer to what the problem was from phone customer service. Wish you luck.