No reaction after change and application

Hi,

I have a problem with the application tunnel. Things changed on my vpe and about the server, so I had to change the delegation in the domains and in the cloudflared tunnel. After changing to a new IP in Cloudflared, the old IP keeps appearing in the preview. There are also no plications visible under the domain, only error 502. Does anyone know how to contact support where I could report this error or does anyone know what is wrong?