This is what I had for my last trip:
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Both longhaul LH segments cleared into I after being on waitlist. The first didnt get stickered, so the DCS (amadeus altea) rejected online and agent checkin. The eticket helpdesk had to manually update the first coupon for the DCS to accept the coupon. My seat in C was safe, since the PNR was updated correctly, just the ticket was not updated completely to the satisfaction of the DCS. Everyone looking at the booking agreed the upgrade was legit, so you will not be denied boarding or downgraded, just budget enough time