UniFi controller, unable to adopt device: INFORM ERROR

We had an UniFi controller installation where we were unable to adopt a small amount of devices, like three out of forty. It was very strange, everything worked perfecly except those few.

The error we found in /var/log/unifi/server.log was just:

server.log:[2019-06-20T16:11:53,707]  INFO  dev    -    [state] dev[aa:aa:aa:aa:aa:aa] UNKNOWN->INFORM_ERROR, state_expire=0
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