Couldn't confirm settings with all the beacons. Doesn't work app indoor location

I have followed all instructions for demo app indoor location but doesn’t work. i created new mesh, i have verified firmware and it’s the same, i tried with different iphone model, i have put the beacons in differents room sizes, i have read the forums. finally doesn’t work. I have two development kit, 8 beacons and tried differents mixed way. Always response is same “Couldn’t confirm settings with all the beacons”

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