This blog post by npub16jzr7npgp2a684pasnkhjf9j2e7hc9n0teefskulqmf42cqmt4uqwszk52 may help you as well if you have BTCPay as a backend. I was able to resolve my CORS issue and it works correctly now:

https://orangepill.dev/lightning-guides/guide-to-create-lnaddress-redirection-on-your-domain/