Reconnect matter device ("already paired")

I am trying to reconnect (pair) a wifi matter device (sonoff minir4m) to homey pro which I needed to remove because homey pro did stop connecting to it (although it was online).

The problem is that when I try to pair the device again I get the error message that pairing is failing because the device is “already paired”.

How can I add the device effectively again?

Kind regards
Georg