@korina hello, i deleted the station and did a new setup. station ID is f069bce6 again, copied a new key in the weewx.conf and restarted. weewx is running for more than 12h now.
weewx ERROR weewx.restx: Windy: Failed to publish record 2021-11-19 05:45:00 CET (1637297100): Failed upload after 3 tries
i´ll keep waiting. greez & thanks