You have reached the maximum number of claims for today with an unverified email----> where and how to confirm email?
Where do you get this email? from what website/exchange or any services? You might read it right that they only require a limited login confirmation, which is you never confirm one of this emails and that's it.
So the most possible reason is to wait another 24 hours for this then you can login again, just make sure that you use a decent email provider like gmail so you can receive it on time.