Yes, I removed the entries in device tracker yaml file. Reboot hassio, it was repopulated and it than it worked again for me
Thanks for the fast response, it worked perfect
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Thanks for this advice, but won’t deleting my entire known devices yaml mean i lose the names I have customised for them, and then my automations that use those names will stop working?
Yes, but you can rename them once they get added back and reboot.
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done, thankyou, seems to have resolved it