Fix cors issue for subdomain url tagging server

I set up a service on cloud run for Facebook server tracking with server Google Tag Manager, I have a subdomain for the url tagging server. I'm facing an Access-Control-Allow-Origin issue on my main website. This problem can be seen in the console browser issues when navigating to track user interactions via Facebook's server on a subdomain tagged by Cloud Run. The server tracking appears to work perfectly when I test it on Facebook's test events tool.