Hi there! Thanks for reaching out. Just to make sure I understand—your MLB app subscription is active, but when you try to watch game replays on your Mac (OS X 10.15.7), no games show up for replay, correct? Are you able to watch any live games, or is it just the replays that aren't showing?

While you check on that, here are some initial things we can look at:

1. Check for Local Blackouts: Sometimes, game replays are restricted due to regional blackout rules. This can prevent you from seeing certain games or replays in your location. MLB has details on blackout rules you may want to review.

2. Log Out and Back In: Sometimes refreshing your login session can help. Try logging out of the MLB app on your Mac, then sign back in.

3. Update and Restart the App: Make sure your MLB app is the latest version. Quit the app, restart your Mac, then reopen the app.

4. Check Network and Permissions: Ensure your connection is stable and that the app has permission to access your network and location (location permissions sometimes affect content availability).

If you have already tried these or if the problem persists, we can dig deeper by checking your subscription status on MLB's website, clearing any cached data, or trying the web version in a different browser to isolate the issue.

Please let me know what you've tried and whether you can watch live games or if the problem is only with replays. That will help me guide you better!