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Home Assistant has lost all my lights
(feddit.uk)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Check what IP HA is expecting and then check the IKEA hub to see if they match. If you have DHCP turned on for your hub then when you moved it it might have gotten a new IP. Easy fix its the case, just set a static IP on the IKEA hub for what HA expects and then restart the integration.
You were correct, though I couldn't find a way to update HA with the new IP. Ended up just re-configuring the Ikea integration, weirdly it's forgotten half my bulbs.
Or make it old school and use the hostname instead of the IP.