To troubleshoot AOL email not working on iPhone, then the effective solution is to reset network settings:
Start by opening the settings icon on iPhone.
Click on general settings options.
Move to general settings and choose the reset option.
Choose the network reset option, and the network settings will reset the iPhone device.
Reconnect the iPhone to the network.
You can see AOL mail not working on the iPhone issue is troubleshot or not.
Check out the steps to troubleshoot the issue of AOL email not working on iPhone devices.