Per Meta…“The user tagging feature will enable developers to allow users to tag one or more users during the Reels publishing process via the IG Content Publishing API. This feature works the same way as in Instagram’s first-party interfaces. Tagged users will see the Reel published in their tagged tab on their profile and receive a notification.”
“The “Original Audio” rename feature will enable developers to allow users to change the default “Original Audio” name for any original audio they own when creating a Reel via the Instagram Reels API.”
Read additional Instagram Content Publishing API change announcements here