403 forbidden in 1 domain but not in another domain

Hi all,

I try to setup a cloudflared Zero Trust Tunnel.
However, I get a 403 forbidden error.

The following combinations i’ve tried that don’t work.
cloudflared on company server with company domain to company service.
cloudflared on private server with company domain to private service.

The following combinations i’ve tried that does work.
cloudflared on company server with private domain to company service.
cloudflared on private server with private domain to private service.

both company domain and private domain are DNS hosted trough Cloudflare.
Both use the free account and free Zero Trust.
both are managed to my account. (als tried switching to the company’s overruling account, same problem).

My conclusion, some setting in the company’s domain at Cloudflare is making these 403 forbidden problems.

What settings should I check? because I can’t find anything wrong.

Never mind, found the solution.
Disable Railgun.