I have VaultWarden running as a Proxmox LXC behind a Cloudflare tunnel. I am able to login to the instance from my Windows PC using my custom domain URL but when I download the BitWarden client on my Android phone and attempt to login to my self-hosted URL it fails as soon as I enter my password and hit enter.
It tells me “An Error has Occurred. We were unable to process your request. Please try again or contact us.” I can login to the instance on the phone from the browser just not the app.