tracking for apps

See this,

Manage activity tracking permissions

At any time, you can change your mind and give or withdraw permission for an app to track your activity.

1. Go to Privacy settings to see a list of apps that requested to track your activity. On iPhone, iPad, or iPod touch, go to Settings > Privacy > Tracking. On Apple TV, go to Settings > General > Privacy > Tracking. 
2. Tap to turn off or turn on permission to track for a specific app.

If you turn off "Allow Apps to Request to Track" in privacy settings, you'll stop seeing prompts from apps that want to track your activity. Each app that asks for permission to track while this setting is turned off will be treated as if you tapped Ask App Not to Track. You can also choose to ask all apps that you previously allowed to track to stop tracking your activity. Or you can allow just the apps to which you previously gave permission to continue to track your activity. 

In some circumstances, the “Allow Apps to Request to Track” setting is disabled, including: 

• For users with child accounts or under age 18 by birth year, signed in with their Apple ID*
• If your Apple ID is managed by an educational institution or uses a configuration profile that limits tracking
• If your Apple ID was created in the last 3 days

In these cases, all apps that request to track are denied permission by default and do not receive the IDFA. If the status of your account or device changes, and you subsequently choose to enable “Allow Apps to Ask to Track,” then the app's next request to track will display the permission prompt to you.

Pasted from this support document. If an app asks to track your activity - Apple Support

If this has to do with your Apple ID, then you will need to contact Apple for assistance.