Hi! I see you're encountering that "Sorry something went wrong" message when trying to log in to the Tandem app on your iPhone with iOS 18.4. Let’s get this sorted out together.

First, could you tell me a bit more?
- Are you entering your email and/or password correctly?
- Do you recall if you signed up via email, social login (like Google or Facebook), or another method?
- Have you tried any fixes already, like restarting the app or your phone?

Meanwhile, here’s a simple step-by-step approach we can try:

1. Verify Your Login Method & Credentials
Make sure you’re using the exact email or login type you initially registered with. Sometimes using a different email or login method causes this error.

2. Update the Tandem App
Go to the App Store and check if there’s an update available for Tandem. Updates often fix login bugs.

3. Restart the App and Device
Close the Tandem app completely (swipe up from the bottom and swipe the app off screen). Then restart your iPhone to clear any glitches.

4. Check Your Internet Connection
Make sure your internet is stable, try switching between Wi-Fi and cellular data.

5. Reinstall the App
If updating didn’t help, delete the app and reinstall it fresh from the App Store. This can clear corrupted app data causing login failures.

If after these steps the error still appears, it might be related to an account or server-side issue. In that case, I recommend contacting Tandem’s support directly at [email protected] for personalized assistance. They can check your account status or investigate backend issues.

Let me know which steps you’ve tried or if you want me to walk you through any of these! Are you satisfied with this approach so far?