Cors blocking requests

The issue I am facing:
I cannot perform a fetch request to my pihole instance because cors is blocking this.

Details about my system:
My pihole is behind a reverse proxy, where i already added the access-control-allow-origin header. I also followed the steps in this post: Cannot access api.php Json from localhost or different server.
I still get the message: "Failed CORS: mydomain.com vs 192.168.0.202, pihole.local.mydomain.com, pi.hole, localhost"

Please upload a debug log and post just the token URL that is generated after the log is uploaded by running the following command from the Pi-hole host terminal:

pihole -d

or do it through the Web interface:

Tools > Generate Debug Log

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