404 for some images with Backblaze B2 Content Through Cloudflare CDN

I have setup a link between Backblaze and Cloudflare CDN thanks to this alliance. I also have setup seom cache in Cloudflare.


For some reason, I get sometime 404 errors for some existing images and sometimes not.

If I wait and retries it cames back again to normal…

What do you think I can do ? Where can I debug this ?

I follow soemthing similar to this :