That was information well hidden in the marketing. I thought I had checked everything, with One Mesh taking quite some time to actually be available on the AX10, but apparently I missed the "no One...

@Paramedicma I have a EU Hardware Version : Archer AX10 v1.0 v1.0 with latest 1.2.5 Build 20211117 Rel. 38093(4555) firmware. It's running as an access point but doesn't show One Mesh. Any solutions?