The dropdown for "Continue session" or "Start new session" does not seem to work. Clear your dfrnt.com cookies if are able to use DFRNT in a different browser.
If you don't manage to resolve your issue, send a support request to support@dfrnt.com.
This works in similar ways across browsers, do clean them for dfrnt.com and for identity.dfrnt.com. This is a known issue, and we are working on a fix.
How to clean cookies for dfrnt.com in Microsoft Edge:
If you have a popup blocker, you might want to disable it, or keep an eye out for it as DFRNT might want to open an extra window to refresh your session information. The reason is to prevent any work getting lost during cookie and identity refreshes.
This is rare, please notify us if you get stuck so we can take a look at it and if needed put in place a better solution!