Hi there! I understand that you’re having trouble signing into the YubePiP app on your iPhone running iOS 17.6.1. To help you better, can you tell me if you get any specific error messages when trying to sign in? For example, does it say anything about "not trusted" or "unsupported browser"? Also, are you using your Google account to sign in?

Meanwhile, here’s a step-by-step guide we can try to fix common sign-in issues with YubePiP:

1. Check Internet Connection
Ensure your iPhone is connected to a stable Wi-Fi or cellular network.

2. Update the App
Go to the App Store and check if there’s an update for YubePiP. Sometimes signing problems happen if the app version is outdated.

3. Check Date & Time Settings
On your iPhone, go to Settings > General > Date & Time and make sure "Set Automatically" is turned on. Incorrect time settings can cause authentication issues.

4. Clear App Cache or Data
Since iOS doesn’t let you clear cache easily, you can delete the app and reinstall it from the App Store. This can clear corrupted data causing sign-in errors.

5. Login with Google Account Issues
YubePiP uses Google login but some users face “not trusted by Google” errors because the app’s embedded browser might be unsupported. If you get this error, try this:
- When you see the error screen during login, try pressing and holding on the link at the top (usually the “accounts.google.com” URL) and open it in Safari. Then try logging in there.
- Alternatively, wait for a future update since the app developers are working on fixing browser compatibility issues.

6. Restart Your iPhone
A simple reboot often clears temporary glitches.

If you can share which step you’ve already tried or describe the error in detail, I can guide you further with more specific fixes.

Are you able to check these and let me know how it goes?