IMAP Migration from Gmail

I have been trying to import my email from a Gmail server and keep receiving the following error. I have reduced the security, activated imap and no improvement. The link to the Google support item has not helped.

Unable to connect to your account. Please Click <a href="https://support.google.com/mail/accounts/answer/78754" style="text-decoration:underline;" target="_blank">here</a> for more info .