Gmail - Unable to verify account name or password
Only recently, maybe 2 weeks ago, suddenly I cannot sign in to any of my 3 personal Gmail accounts on IOS or OSX mail, I set them up not using the "Gmail" button when you set up your accounts as I didn't want to use IMAP so I set them up using pop3 manually and they have all been working fine for years but now suddenly no, they will not connect on Mail on OSX or IOS, browser webmail is no problem, I cannot find the problem on IOS or OSX mail and I am not even getting the emails saying suspicious sign in detected was it you? ...just "Unable to verify account name or password"
I've searched and searched for an answer, but can't find anything, I've tried every browser under the sun changed passwords, cleared caches, private / incognito browsing but all I want is for it to go back to being able to receive and work on mail on my Macs and iPhones, I've tried over 6 different devices that ALL worked fine a couple of weeks ago.
All I can think is Google has changed some security update and I don't know how to use it now without using the mail "Gmail" set up with gives me IMAP which I don't want as I need everyone using this mail to see an unread email on their device and read it on their own device not have it synced across all devices as read after only one person has read it,
Can anyone help ?
iPhone XR