Some of my cables move freely, and the sound really sounded like it could be the electrical connectors in the top tube under the TCU, so I removed TCU and rode with it dangling beside the bike, connectors outside the top tube, and got same tapping sound. Mine was totally fixed with head tube...
Thanks so much!
2022 Levo alloy started quiet and rattle /tap getting louder and nearly constant.
I was sure it must be something rattling under the TCU (nope)
Mine was a loud rattle, aluminum knocking, TApping, occasionally squeak or groan. Getting quite loud. Same sound if on or off...