Hi! I understand you're connected to WiFi but MyChart is giving you a login error asking to check your connection, while your wife can log in fine on the same WiFi. Let’s try to narrow this down together.

First, just to confirm, are you using the MyChart app or logging in through Safari on your iPhone? Also, have you tried switching from WiFi to your cellular data to see if the login works then? This can tell us if it's a WiFi or device-specific issue.

While you check on that, here are some quick steps you can try:

1. Toggle Airplane Mode: Swipe down to access Control Center, turn on Airplane Mode for about 10 seconds, then turn it off. This resets your network connections.

2. Forget and Re-join WiFi: Go to Settings > WiFi, tap your WiFi network, then “Forget This Network.” After that, reconnect by entering your password again.

3. Restart your iPhone: Restarting clears temporary glitches that might affect apps.

4. Clear MyChart app cache or reinstall: If using the app, uninstall it, then reinstall from the App Store.

5. Check for iOS updates: Go to Settings > General > Software Update to make sure your iPhone iOS 18.6 is up to date with any patches.

6. Try logging in through Safari instead of the app as a test: open Safari and go to the full MyChart website to see if you can log in there10.

If after these steps, the problem persists even switching between WiFi and cellular data, it could be an issue with your MyChart account or a server problem on their end.

Could you please try those steps and let me know what happens when you attempt them? That way, I can guide you further.