One of my 4 Zigbee switches 'fell off' config, how to fix? (Xiaomi Gateway)

I have the Xiaomi Aquara gateway and 4 power points. One of them is simply not working, no idea why.
How can I remove and re-add it? I know it can be done in the Xiaomi app but is that how it should be done? (When I log in to the Xiaomi app now, it shows no devices on my whole network, I only use home assistant with it)

I’m not sure what to do, is this common?