I just had this happen today, 12-22-2020, as well. I bought 3 barrels and they never came into my inventory.

I am in the Iokath traitor stuff and cannot progress. I try every day, but even with the buff I can't kill even 1 of the droids before I die. I think it would have been possible if I hadn't hit 71 during my fight. In my original attempt I had 1 droid down, hit 71 when it died, and immediately died to the remaining 2. When I ran back in all 3 were back up and now I can't even kill 1 before I'm dead again. Incredibly frustrating.

It didn't work for me either. I'd like to get this toon into Onslaught, but it doesn't look like that's going to be possible any time soon. I feel bad for new players who wanted to play the expansion. Without the rep to buy the token buff they won't be able to even attempt to pass the droids.