I managed to get 2400+ Mixamo animations retargeted to UE5’s Manny skeleton using iclone 3dxchange.
So for anyone who owns a license to Iclone and 3dx7, this is a way to go. Download your desired animation packs and convert those to UE5 using 3dxchange.
In the past, Mixamo had an option to download animations and characters rigged to the UE4 mannequin, but unfortunately that option was supressed by Adobe months after the acquisition.