Getting Cors error for beta testing site

[samofwise]

Hey, I am trying to use https://thingproxy.freeboard.io/fetch/ and find that it works when the origin is localhost but not for my beta testing site.

Url i am trying to access: https://character-service.dndbeyond.com/character/v3/character/4338000
Url i am using: https://thingproxy.freeboard.io/fetch/https://character-service.dndbeyond.com/character/v3/character/4338000
Url of beta testing site: https://beta-dmscreen.samhenry.tech/

Works fine for: http://localhost:44390/

Error found:

[HexorHex]

I've gotten the same issue too