Apple Mail AOL log-in "Unable to verify account name or password"
I've ben using AOL on Apple Mail for years; on an iMac (OS Sierra) and also on iPads (now on a new Mini 5). Yesterday there was a pop-up on my iMac asking me to enter name, AOL email address and password. I did that (with the correct password - I can get email via browser webmail using the same password), but it keeps telling me "Unable to verify account name or password". Neither my iMac nor my iPad are connecting with AOL via Apple Mail. I've done a lot of Googling and tried everything I can find that's suggested on the Web, including removing the AOL account. But when I try to add it again, I get the pop-up, and the same thing happens - "Unable to verify account name or password".
iMac 27″, macOS 10.12