AOL email stopped working 48-72 hours ago

I've had to erase my email profiles and reload from scratch on 2 apple devices and 2 macs.

I've been successful on 3 out of 4, but I have a slightly older mac (running High Sierra, 10.13.6) and on this one, for the life of me I cannot reload my email profile. Every time I type in my AOL email (xxx@verizon.net) and password, I get an error message saying "Unable to verify account name or password." I've tried using the Mac's user friendly account setup (where you choose AOL and it asks you for the email and password) and a more complex method, trying to set up the incoming and outgoing servers manually. Same message. All my other devices managed to reload but for some reason, not this one. I don't even know who to ask for assistance, Apple, AOL, or Verizon!