Setup WKD at Cloudflare Pages

Hello, I have got a Problem with setting up WKD and Cloudflare pages.

When I use my web server for WKD and Cloudflare as a proxy, everything works fine.

Now a copied my entire site to Cloudflare pages and receive following message when testing WKD:

For testing, I have set up the direct method with Cloudflare Pages (not working) and the advanced method and my own server (working).

When I change the advanced method back to Cloudflare Pages, I get the same error message: “File exists, but it cannot be parsed as an OpenPGP key”.

Thank you very much for your help.