To resolve the issue of being unable to sign into the Meijer app, follow these steps:

1. Check App Status: Confirm if there is a known server issue with Meijer's app. You can check current problems and outages at IsDownUS - [learn more]. It could be that the app is temporarily down.

2. Update the App: Ensure that your Meijer app is updated to the latest version. Open the App Store on your iPhone, search for "Meijer," and if an update is available, tap on "Update."

3. Reboot Your Device: Restart your iPhone to clear any temporary glitches that might be causing the sign-in issue.

4. Check Internet Connection: Ensure you have a stable internet connection. Switch between Wi-Fi and mobile data to see if the issue persists.

5. Reset Password: If none of the above steps work, consider resetting your password. Go to the sign-in page, tap on “Forgot Password,” and follow the instructions. For more detailed guidance, refer to this expert assistance page - [learn more].

6. Contact Customer Support: If the issue continues, reach out to Meijer customer support for assistance. You can find relevant contact information on their official website or through the app’s Help section.

7. Community Insights: Visit community forums such as Reddit where other users might have shared similar experiences and solutions, like in this thread discussing sign-in issues here - [learn more].

By following these steps, you should be able to resolve your sign-in problem. If the issue persists, it may be ongoing server maintenance or an account-specific problem that requires support intervention.