I had the same issue. I think it’s a firmware screwup in a batch of these switches. I bought one 2 months ago, it registered as a TS0044 manufacturer _TZ3000_vp6clf9d. Have all 4 switches working flawlessly. So I bought 2 more last month. They looked the same but registered as a TS004F manufacturer _TZ3000_xabckq1v. They only configured as a single switch.
I complained to seller. They protested. I contacted Amazon. Got a refund for the 2 last ones with lots of whining from Seller in China.