Wemo lights are no longer detected

I have 3 wemo lights connected with a wemo link(starters kit). Till recently all my lights were discovered by homeassistant. Lately, after an electricity blackout,i reconnected the lights to the link but home assistant can not discover them. Instead, home assistant shows my wemo link … All my other lamps, sensors switches etc are discovered and working properly…
Any ideas how to fix this ?