[TLSv1.3] App stopped working on iOS and Android

Description:

Login does not work on iOS and Android. Logged-in users only see the "Waiting for network..." notice. No problems in desktop app or browser.

Environment Information:

• Rocket.Chat Server Version: 3.10.5
• Rocket.Chat App Version: 4.14.0
• Device Name: iPhone 12 / Samsung SM-J530F
• OS Version: iOS 14.4 / Android 9

Steps to reproduce:

1. Enter workspace URL
2. Enter credentials
3. Press "Login"

Expected behavior:

User is now logged in and can chat.

Actual behavior:

Nothing happens.

Additional context:

Affects both SAML users and local users. SAML users see the login screen again after successful authentication.
Debug log contains only server.js:204 API ➔ debug POST: /api/v1/login.

Access log:

Nginx config (running under Plesk Obsidian):

location ~ ^/.* {
	proxy_pass http://127.0.0.1:3000;
	proxy_set_header Host             $host;
	proxy_set_header X-Real-IP        $remote_addr;
	proxy_set_header X-Forwarded-For  $proxy_add_x_forwarded_for;

	proxy_set_header Upgrade $http_upgrade;
	proxy_set_header Connection "upgrade";
	proxy_set_header X-Forward-Proto http;
	proxy_set_header X-Nginx-Proxy true;
	proxy_http_version 1.1;

	proxy_redirect off;
}

Start by reproducing the login flow on the listed iOS and Android versions and inspect the POST /api/v1/login request alongside the supplied Nginx configuration. Done means local and SAML users can complete login and reach chat on mobile without returning to the login screen or seeing “Waiting for network...”.