Originally Posted by
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Could be you’re picking up Wi-Fi from another adapter, not the one under your desk. Are all your sockets on the same ring-main? I had a similar issue in my extension, until I realised that the extension sockets had their own circuit, so the adapter wasn’t connecting to the others via the house wiring. So the adapter under your desk might not be connected to the others if your scenario is the same as mine.
If it’s not that then try a different cable from computer to adapter. If it’s not that I imagine it’s a faulty adapter.