We had the same problem could not revalidate the email account credentials, we contact support, we tried lots, password resetting, domain MX records look up and still we could not login into Office 365 email account and keep on receiving “To keep your account secure, we need to revalidate your account.”
The solution in our case was simple!
Login into Godaddy dashboard – administration panel: https://mya.godaddy.com/
Go my products -> email and office -> manage – email account -> change password
You need to change EMAIL password to a more complicated one that contains more symbols, letters, capitals, length etc.
Then login to your Office 365 accont email: http://email.site.com
The account is verified and all is ok.
It looks like the problem is the account password creation criteria.
Most probably criteria are different between Godaddy and Office 365.
So if you select a simpler password with Godaddy and then you try to connect to your Office 365 email account the system denies and gives the ever repeated with no HELP answer. This might be a problem that needs fixing by both providers.
