Cookies for the identity server are not allowed.

the firewall is blocking assessmentQ.

an account exists with the same e-mail address and password in 2 different channels (e.g. the EduQare channel).

You are using the wrong url (e.g. a wrongly set bookmark).

Update your browser to a recent version.
Allow all cookies (how to do this for your browser can be found online).

Contact your IT department to allow the following URL's: assessmentQ URLs

Ask an administrator of one of the channels, to change your password.

Use the correct URL (and bookmark it if necessary): <subdomain>.assessmentq.com.