Hello! Sorry to hear you’re having trouble signing into your MyFrontier app. Let’s see what we can do to get you back in.

First, just to understand better:
- Are you trying to log in from your Macintosh device running OS X 10.15.7, or is this issue happening on a different device?
- Have you tried logging in via the web browser on your Mac, or only through the app?
- And when did this issue start—just now, or has it been ongoing?

While I wait for your details, here’s a straightforward checklist to try:

1. Check Your Internet Connection:
Make sure your Mac is connected to the internet steadily. Sometimes flaky connections can cause sign-in errors.

2. Restart the App or Browser:
If you’re using the MyFrontier app, try closing it completely and reopening it. For browser use, quit and relaunch Safari or whichever browser you use.

3. Verify Credentials:
Double-check your username and password to ensure there are no typos.

4. Confirm Service Status:
It’s possible there’s a temporary issue on the MyFrontier servers. I recommend visiting the official status page or contacting support to see if there’s downtime.

5. Clear Cache and Cookies (Browser only):
If logging in via browser, clearing cache and cookies in Safari can sometimes resolve login problems.

6. Update Software:
Make sure your OS and app are up to date, as outdated software might cause compatibility issues.

If you have already tried any of these, please let me know which ones, and we can dig a little deeper. Do you possibly see any error codes or additional messages besides “We’re unable to sign you in at the moment”?

Looking forward to your reply so I can assist further!