If I am reading this last post correctly, this booking was originally made before the promotional period and then changed within the promotional period, only to be changed again after the promotional period had ended. I think the likelihood of this ticket not getting 2x miles in this case was 100% (and correctly/justifiably so), but thanks for the input.
Btw my 2x miles posted within 24h of flying and it took my status around an additional 12 hours to change from blue to silver. The fun fact here is, that I almost got enough miles to requalify until October 2022 (this will likely only require one return flight with 1x miles in comfort flex). This will also probably be the closest I will ever get to reaching gold (currently 12 months to gather 13k miles), but since this generally isn't worth pursuing to me, I would probably only consider it if another 2x miles + 50OFF promotion turned up.