Same problem for my station ID: 1f06c5bac.
I have sent "https://stations.windy.com/pws/update/MYAPIKEY?station=1&dateutc=2021-07-01T15%3A38%3A46Z&winddir=210&windspeedmph=22.816788&windgustmph=30.19869&dewpoint=7.3&temp=21.10&pressure=30&humidity=37.89"
and I have recevied this message "SUCCESS (valid measurements count: 7, valid station info count: 0)"
Thanks for replies :-)