SaveFormSubmission blocked by CORS policy

Our website is using Weglot as language translation tool, where the chosen translations are handled in sub-domains - e.g. “” where the main domain is “”.

Our contact form at our main domain - Contact us for more information about our tyre handlers - works perfectly, but at our sub-domains it do not - we get following error:

Access to XMLHttpRequest at ‘’ (redirected from ‘’) from origin ‘’ has been blocked by CORS policy: Request header field x-csrf-token is not allowed by Access-Control-Allow-Headers in preflight response.

I do not have any knowledge about CORS, so is there anyone who can guide me in the right direction to solve this? - is it a Cloudflare setting or …?

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