https://spacepolicyonline.com/news/ariane-6-lifts-off-but-second-stage-anomaly-spoils-the-day/
“Later, however, an anomaly with the second stage spoiled the celebration and prevented it from reentering into the Pacific Ocean as planned. The stage remains in orbit.”
They showed some video during yhe webcast, looked like the 2nd stage was spinning. At one point they said there was a problem the ended the webcast