Second Innr SP-120 not adding

Just started my Homey adventure. Wanted to start simple so got a pair of SP-120 plugs to start with.
The first one installed fine. Trying to install the second one gives me some trouble.
When I start the installation for the second one, immediately after the (normal) message “push side button for 5s”, it shows a message “status.already_running_command”.
When I push the side button anyways, installation seems to continue, but then ends with “status.add_device_aborted”.
Any clues?

Nevermind, solved it. Restarted Zigbee and restarted Homey. After that adding worked as it should.