Is this something related to CORS in CF?

Hi all! I would like to know if the following error from web console is something related to something not yet configured/enabled on my CF account. Cross-origin request blocked: Same-origin policy does not allow reading remote resources at https://<subdomain>.<base_domain>.xxx/rest/v3/health. (Reason: Unsuccessful CORS request). Status code: (null) I tried enabling CORS by different ways: Page rules, App Access, but I suspect it could not be related to it? As, the message doesn't show that any header is not send/available. The service is publicly available using a subdomain, and CF Tunnels. More info: https://reddit.com/r/CloudFlare/s/VtMctGKKF1 Thank you!
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