It seems like your app was rejected due to concerns related to the transmission of device identifiers, specifically the advertising ID, in a manner that doesn't comply with the Families Policy of the app store. Given that your target audience includes children under 5 years old, it's important to address this issue to ensure compliance with privacy and data protection regulations.
Here are some steps you can take to resolve the problem:
1. **Review AdMob Settings:**
- Ensure that your AdMob settings are configured to comply with privacy regulations, such as GDPR. AdMob provides options to set up consent forms and manage ad personalization settings. Make sure you are collecting user consent appropriately.
2. **Check SDKs and Libraries:**
- Examine other SDKs or libraries integrated into your app. Sometimes, third-party libraries might also collect and transmit data. Review their documentation and settings to ensure compliance with privacy policies.
3. **Update Privacy Policy:**
- Verify that your app's privacy policy accurately reflects the data collection and usage practices. Make sure it is easily accessible to users. Clearly state what data is collected, how it is used, and if it is shared with third parties.
4. **Age-appropriate Ads:**
- Since your target audience includes children under 5 years old, ensure that the ads displayed are appropriate for this age group. AdMob allows you to set ad content preferences. Adjust these settings to ensure that only age-appropriate ads are shown.
5. **Implement Child-Directed Design:**
- Design your app with children in mind. Follow best practices for child-directed design, including simple navigation, age-appropriate content, and easy-to-use interfaces.
6. **Communicate with Support:**
- If you've made the necessary adjustments, resubmit your app for review and provide clear documentation on the steps you've taken to comply with privacy policies. Include any relevant information regarding age-appropriate content and data handling.
7. **Monitor Developer Forums:**
- Check developer forums for the app store in question. Sometimes, other developers might have faced similar issues, and there could be official responses or community discussions that provide insights into solving the problem.
Remember, compliance with privacy policies is crucial, especially when dealing with apps targeted at children. If you're uncertain about any specific requirements or if the issue persists, consider reaching out to the app store's support or developer relations team for further guidance.