Hi there! I understand you're having trouble logging into the UnitedHealthcare app, and it’s showing a message about a problem and to try again later. Let’s see if we can get this sorted out for you.

First, could you tell me if you are using the UnitedHealthcare app on your Mac directly or through a browser on your Mac? Also, have you tried logging in with your username and password recently and confirmed they are correct? Any recent password changes or account lockouts?

Generally, when that message pops up, here’s a simple step-by-step to try:

1. Check Your Internet Connection: Make sure your Mac is connected to a stable network.

2. Restart the App or Browser: Quit the UnitedHealthcare app completely and then reopen it. If using a browser, close all tabs and reopen the site.

3. Clear Cache and Cookies (if you are using a browser): Sometimes old data can cause login issues. On macOS in Safari, you can clear this by going to Safari > Preferences > Privacy > Manage Website Data > Remove All.

4. Update the App or Browser: Make sure your app is the newest version. For browsers, check for updates in Safari > About Safari.

5. Password Reset: If the app keeps saying try again later, a password reset sometimes helps since the app or site might not be syncing correctly. You can reset your password via the UnitedHealthcare sign-in page.

6. Check for Outages: Sometimes UnitedHealthcare services have maintenance or outages which prevent logins.

If you’ve already tried these or if the problem persists, I can guide you through some additional steps like checking advanced settings or contacting support.

Could you let me know what steps you’ve already done? That way, I can give you the best next steps.

Also, if convenient, you could try logging in via the UnitedHealthcare website on your Mac’s browser to see if the problem is app-specific or broader.

Would you like me to help you with the password reset link or checking for service status now?