Also experiencing this issue in the latest tagged image release, using the official Bitwarden app and Tailscale on iOS 18.1.1 I am not able to access my Vaultwarden instance!
Hi everyone, I could fix the issus on the iOS app with allowing “Local Network” permission in the iOS Settings. I use the vaultwarden server with the latest tag and the latest iOS App.
For those who have the latest image version and have their permissions sorted out, but are still having these problems on a new device (or an upgrade): you probably have issues with your certificate. You have to install and trust your vaultwarden server certificate on ios. You have to be able to visit your vaultwarden web page without security warnings.
This was the solution for me BitWarden client 2025.1.0 on iOS 18.2.1 (both the latest versions at the time)