In season 2 we had a big problem that even though gear was Veteran from season 2, only gear acquired from Raid/Dungeons was eligible to be used on the Catalyst
Season 3 finally removed that issue that anything that was Veteran or higher gear, was eligible to be used on the Catalyst.
Now in Season 4, it got reversed again!
So the Champion gear you get from The Last Hurrah weekly is not able to be used in the Catalyst while it’s season 4 gear. Apparently it’s not labeled as Awakened gear, so it’s not eligible to be used on the Catalyst. The reward is Cache of the Awakened Storms, So you expect to contain Awakened Champion Gear! This is bring back the gear confusion and separation that Season 2 gear was suffering from that only Raid/dungeons was eligible for the Catalyst. This excludes casuals and the outdoor world players yet again from getting Champion gear unless they do timewalking (which is limited time) or Mythic week.
It’s rather confusing that Blizzard makes this 180 on this decision since S3 was a really good season that players came back because the system was so accessible!