iOS unable to access server with self signed SSL

I have Immich running on port 2283 which I can access fine through the web browser and the mobile app through http, but another version running with nginx-proxy-manager using a self signed SSL certificate which works fine in the browser, but does not allow me to login through the mobile app. I am using an iPhone 11 Pro Max with iOS 16.3 and both the server and client are up to date.