In order for Conviva to collect your IGTV videos:
Your account must be set to a business or creator profile
You must post an IGTV video through the native IG app, or Creator studio and you must have “Post a Preview” or “Share Preview to Feed" enabled/toggled on during the IGTV media publishing process. See here and here for more details on enabling “Post a Preview” or “Share Preview to Feed".
If you're using a third-party publishing tool check with them to ensure you are properly publishing
If you've followed the above steps and you're still missing your IGTV data, contact Support for further help.