OpenCloud behind Cloudflared Tunnel no Login

[ItsdMeSoFYou]

Describe the bug

Instead of beeing logged in I recieve an access denied message.

Steps to reproduce

1. Install OpenCloud with Proxmox VE Script
2. Setup Server with domain
3. Create Cloudflare Tunnel and add all needed Routes
4. Access Website of Opencloud (cloud.domain.tld)
5. Login
6. Get cloud.domain.tld/access-denied
7. 

Translator fucked that up (I'm german). It actually should translate to "not logged in"

Expected behavior

I expected to be logged in

Actual behavior

Access denied

Setup

Proxmox on a small NUC.
CPU: 2 Cores
RAM 2GB

Additional context

Accessing the Server with the local IP results in: "Missing or Wrong Configuration"

[ItsdMeSoFYou]

"OC_INSECURE=true" in "/etc/opencloud/opencloud.env" did the trick. Don't know how secure that would be though.