What is causing my subdomains to not send data to GA4?

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There could be a few reasons why your subdomains are not sending data to GA4:

1. Incorrect tracking code: Ensure that you have the correct GA4 tracking code installed on all of your subdomains. If you have multiple tracking codes, make sure that they are not conflicting with each other.

2. Cross-domain tracking: If you have multiple domains or subdomains, you will need to set up cross-domain tracking to ensure that data is properly attributed to the correct domain or subdomain.

3. Blocked by ad blocker: Some ad blockers can block GA4 tracking codes, which can prevent data from being sent to Google Analytics. Make sure that your tracking code is not being blocked by any ad blockers.

4. Custom dimensions or metrics: If you are using custom dimensions or metrics, make sure that they are properly set up and mapped to your subdomains.

5. Data privacy settings: If you have enabled data privacy settings or consent management, make sure that you have configured them correctly to allow data to be collected and sent to GA4.

6. Browser settings: Some browsers have settings that can prevent data from being sent to Google Analytics. Make sure that your browser settings are allowing data to be sent to GA4.

7. Network issues: Finally, there could be network issues or server problems that are preventing data from being sent to GA4. Check your server logs or contact your hosting provider to see if there are any issues that need to be resolved.