I tried to configure Mesh network on 2 RUT200 and 1 RUT240 at the same location and I won’t work on all of them. I’ve read that Mesh is not supported on the latest firmware for RUT2xx but I managed to use it on another group of 3 routers on the latest firmware in another location.
Apologies for the inconvenience. The RUT2XX product line currently experiences issues with mesh functionality. Planned fixes are scheduled for release with the upcoming 7.7 firmware update, anticipated to be available either this week or the next.