My app can't create cookie over cf

I’ve a rails app and it uses multiple domain. I’ve tested it with different domains at cloudflare and everything worked well.

But last day I’ve tested it with a friend’s domain and it seems like cloudflare can’t carry cookie headers from app to browser. Because when i want to sign in, the app doesn’t work and I can’t see and app session’s cookie in my browser.

But again, it works well with another cloudflare account. So what can be the problem? I’ve searched something about it, but couldn’t find anything.

Thank you

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