Hi Ellen,
1. Is the issue confined to AOL mail?
2. Have you made any recent software or hardware changes on the system?
This issue may occur if the AOL mails are not syncing properly with Mail app.
Method 1:
Let’s refer to the article and try the steps provided to update your app, sync the app license and run the Apps troubleshooter
to fix the issue.
What
to do if you have problems with an app
Method 2:
If the issue persists, you may try to remove and add AOL account on Mail app.
For further information, refer to the article:
Mail
app for Windows: FAQs
Hope the information helps. Let us know if you need further assistance with Windows related issues. We will be happy
to help.