Gmail sign in issue

I have three gmail accounts signed in through my eM Client and one was blocked his morning. I’ve spent the best part of the last 1.5hours going around in circles. My security through google is set as “use less secure app” is turned on in my gmail account and the settings for POP and SMTP are the same as the other gmail accounts that don’t have the issues… It worked fine yesterday… is there something obvious I am missing. Two part verification is turned off in my gmail account in case that contributes

If using the FREE version you only can use 2 accounts. With the PRO you will get unlimited accounts.

BTW, you don’t need to use the “less secure apps” with eM Client.  It will bring up the appropriate 0Auth2 dialog box to sign into gmail in a secured manner.